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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluxazo 25hi*)g5fip3v; bmp r0n k-a*9iouh 7xg y except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thai( ts8. ;;x:a:dywnm3jmddfo t the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kw8y -lmduwef7m3ud2 1 ind of change on the inducew1umy 832 f7-lddmu wed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wt4hz1 u)vto +nire produces what ki4n tzv u)h+o1tnd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the i1f k0jt pv6kq m:ua-j(qq1 n)my2b5ku ndutv:1kkku q 12m5mpqu jy)q a0fj-n(6b ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetzvwl,.i *b ,vr6xl(nu5ld j 1nic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an indujkz g1akjb8eh5m9 v5k3 f0+mrced current in a conductor will be tjv 3 ej85gmr 1m90zk5bh fk+kahat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table.: p ;iu7+x 0lwptn(nsn A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed +7lp ;wpnunn t :xs0(ifrom above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a 0.*x x 4o7 uit2u+kfoabtmhubn+ zd4-horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abozad. 042uto bh+ ftmb-7no4uix *k+uxve)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top inmepod0,9eb; ;q.jlh u a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil a9ep0;,emhq o jdlu;b .s the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the m:5u-0 6e rsg 5kw v*uakd.hbcf/dg0t kagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field i :vb5aht0f/ucdkd0 g gu s5*ekk-wr6.ncreases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field tvhvq.k3me.- us19 fkpoints straight down. The magnetic field disappears suddenly. .sekumv1hf kq9.-v t3 When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a,,4tq/d mc(fonk;we qjj3pn0xoq .k3 horizontal table and carries an ever-increasing current northward. Two coils of wirnt3,3eqcp, kkqd;nf/4q.j 0w jo(ox me lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering f3kwbxjytljc eo- g: v 6d)+.7girst. As the north pol)ec7jw.3v yxbd- 6+k go jgt:le enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular v /t3 oge3pz1h 8:ko4so)cg xispeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced 3ig)g e 8: chx4oo /pkvt3z1os$emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abouwlims/y/)(ke t an axis whose direction can be varied. In a region where a uniform magnetic field points ste// yk mi)swl(raight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.r.5ueg 3wqq4 v
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways thatara +*lw*lkbeeg 8d *))luq4r an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic4hm)bd-0egzz cg9it , field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-westi*goxo r9zc 70 direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induce7r0oi *og9z cxd across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular ;5 tomizi.p:tvelocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorom+wtu07ca5lfl3u :z*j rgt6 transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each seu7+ dmc4mc pm7cond. The frequency of tm74cm+c 7udmp he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicg+: /sp yvg4dye used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thapfp6 6ajuw /g/t

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than zu2nagsb x:/)lc:nb 3the primary coil then it is a sz l::bngxbu) na3/c2

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loodc2v:d+hmgrzd -y+ 04i1k ywdps than the secondary coiy y0rzm:i+kc-+d 2dhgwv 41ddl then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power cn/35yrec 3.ljdv c -gxz8e6oinput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circ44,b rdn-vsmfl y 34vjuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ivfat a(ii rh -zoe7qyq)7m-36deal battery of constant terminal voltage. At th6ei(z h7ya-ftq7o 3ar im)v -qe moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in oq* rkp5va x3rt1( yq3series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acros3qao pxk5v13y r (rqt*s the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductanc5vfbqh )h9w 8q2aze4q nh3k/we L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit wi 5fsha88 :be0 sxu+mzkth inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time cowt dvq,u19dj;o6 mn30bl( pwaq5r2 yfnstant for the circo0 b3m5d9q2v 61unradft(wqj;y,w lpuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The bacrbxhq +0a ixf+wvk/ir: 8/b0ttery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the currfha/ +ibq0+rbxv x:8kw /i0rcent to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same u8k/ /a+i/ 4u+pzcgsv sy+cpbv hoj*+arnu0c 1nits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circui a2gg4t0qm so;t, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power sup-wxi1 p*mxh ,dply. In this circuit, the currenim1-dp,x xh* wt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changepszg1 z0y8ave fgx+b5:z8h ;os by what factor when the frequency is tryba1sfgez8gzpxvz : h; 5+ 0o8ipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor)svgs;5guz;od uw( 2 r is doubled, the inductive reazgur)d;g u; s ov5(s2wctance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, th)g*) frgnv5hae inductigv nhrgf5))a *ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected lch:6o3t3 fup to an AC power supply. In this circuit, the curreu 3t3 oc6:pflhnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when thv*pt2u4qeyf tyak/ z9+iy5u 0e frequency is tripled+q0e* uyt/uyazykip f5t9 2 v4?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capa ,o5d4aif 2vaj: o/alik/lx+ocitor approaches zero, the capacit5lka/xd,/+ : aioj2ivoa 4olf ive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betwe6-j ujc ijbs-1 *et/kas t ; +z-uym5mkgl;;qeen the voltages of the inductor and capacitor in a RLCttsemz- jcimkba/ule; -;; sjjk+y- *65 qg1u series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defin83 3r vb w zau2w.:qro+(9lg kdy3ohuaed as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuityz6o8s (iejd- ;le9rq . The impedance of the circuit increases if R increases. When is ths-8jl r ( oi;q9yze6deis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circugx-d-uenaow u ./r43h(o w3wx it increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circu/rw 1 2/r: mf/eq r.urxfkuhd2it. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capz7k n9p;s 8 emsrp+:pcacitance both double in an LRC series circuit, the resonant frequency of that cirme ps89p+cp r:;n7s zkcuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At reso+ u::aqufgyxblk;,1 e nance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC c nkofx0ve1y ceki3(cmr858( gircuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.ajimer/5 y, 7hl7p/o6rnq . b6qsklt4 20 T. Fi rrpl,7 6klh7na5./ 46 /qtjbqsioym end the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic 7 xq7:im2 buq2 nls*t9wdjq1 3dveq+e field of 0.20 T. Find the magnet*je7 79uql m2v2qwx:qt dn+ei3dsb q1ic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a ug)*a2 fcn;psh niform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a;fasg )2n *hcpnd the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an ak-x,sg8 az r7wdjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil1 z0tpa7gxz* twg7/zv changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with 2v a(; hoqgb21dsdm w,sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.(1odgdbw mahs2, qv2;0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns. a9xwa.dajla4/lw+ 4 hm(se3pxh0j p and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns ando2xiuu 5ax7qy ql 09x)ji1ei 1 area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizg. 97mdd7/+dcn24mkyah/ bka iwz -fp ontally at a location where the downward component of the Earth's d2/ 9p4iwz7 facd7nmy.bkkm- /+ha dgmagnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is x +bm9qtc;u8ch7o .z: ku g*eg2.0 m long rotates at a constant angular velocity of 2.0 rad/b9 ;gzxo8h.u+tugce mc*:k 7q s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional areaztzc ug43 lr x*3ka0d2 of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists on q5kzdk.).ai1bkx0 jf 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each j lha)net yz8 0c3p/u0loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a ucjuz8/pt0 l0 he )y3naniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns o iu1 wq7gqi/7, 7fklnbf wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator w4jxf7;vuw4 kz(;u dx/9b*v mt .qces sith an output of 12 V maximum when rotated at 60 Hz. A magnetic fietcfxv7q. m(z;u*b k xdvw4 seus 4j9;/ld of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with ac(z1lzr9 y 3oq2g( p0tbv:fj e maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor havsvehs75h q3+ ) plv(ick(d-fke a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ogybx*qw7 hc wp84 vw9;jh4/o xperates on 120 V AC, and when running at fu;vg9h7hwq x 4wc8b/*wyo j 4pxll speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internaa/;* 0fwlri:v7il l pwl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is tilll 0:p; v/7a iwr*wfhe start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supr,u.iwemz0+ b b5gis/bh*9 vaply. The operating current is 1.0 A at full speed. What ir 5aue9 vb,.ibzm*g i0sb/w h+s the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanctj fd63engg;ta/* -mke 6.0 W is connected to a 24-V power supply. The operatinktm*ga; dn-gfe 6 /t3jg current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prim6mw/uoo sh-.:i0deg p6 *nmvbary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to a3*9fczs z2 peqfmk 8ip3y 62yflow in the secondary. 6sk3 2y zi8 pfye c2amp*z3f9q How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, houxd(tl 8jztz j84o7e ,w many turns are necessary in a 110-V primary if the 24-V secondtj,(7e 48z dozjt8lxuary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coilftb j-t)oq;b 4 and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in t4-)jfq ;bo ttbhe primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primamwj9,n9 f;)z4kgkuedrkh-a 3ry of a transformer. Assuming 100% efficiency, how manufma)kkd3gh rwe-n9, j z;9k4 y amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer xdz q*x 2fyy8v,e/*m lprovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does 28* qvx d lzy*,fyemx/the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil andpn2 z: uff/1ik)d 3utv 300 turns on its secondary coil. If 120 V atp/zunf:3 2d1utk ifv) 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its se lv dhzt.d4w8,condary coil. If 120 V at 2wt , lhvdzd84..0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 wzsw;:fg mi9k i(l))v ;8u:(bejnjsp turns. If the input current at the prima9vfj:ew; )bw gm:kzip s8ui;ns(( j)l ry is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its d1 t *y2o8sug2d(iyse ; xq,znd5fq a.secondary has 200 turns. If the input voltage to the primary is 100 V, we ca e2,*dy od.andz yg2xtssq;f(u81qi5n expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hah 2 gsx;m(d1pb 9vca :1h:sqjbo5ih(ys 200 turns. If the power input to the primary is 100 W, we can expect the powd :b ch:y15ghsxj9so(p1;(iqb v ha2 mer output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagqj83 4cgw7tc ye is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 43 yg8jccw7qt has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cur5h ;k1 t:zgesk2no4o +jz-fz orent at 120 V. The voltage is usually stepped up to 4500 knzk+otf-z: h s5g ;ezj21o4oV by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 Vj-c7 uyvm (c,vse)x c0. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0j)vc7-0ve xmy( uc s,c W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission li3;ed4 wyvl)do:k q e(qne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy ye vd:3;)okw(dq l 4qewould be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km nvq).gelmuxgj. ;l6 4long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns rati e.)nj6 ;gl m.vlguq4xo of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less p2 144f i*hnuw6if:aa)wezju power would be lost if the power were transmitted at 3000 V instpja w*1:6uf4iaz2 wn4i ehu)fead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line wm+:l/ x nwefgijbd8r(e(c(1 l elh+x (ith resistance of 0.60 W. To what voltage must the generator output be stepped up wicb(g++jxi /mwexfdlrnl e:l((1 ( 8eh th a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coi3jk0 rw)( x7xg7x;7duqv u2*.zi x( jukbfirbl's magnfudjg3ij7uri.02;b xv*k z x7(xuk(wr7x q )betic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H induco ryny:p ph+kubu-i 9e:om(*0tor. What is this circ o:me+ru:p9k(ou0* p iy -bhynuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wkjyshxhz29 +ajg96e/4b1q/gjeh/2p x l ,l lwhere the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currentsnvz+ 921nkf;n vq ym2?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of asyl8u6 iv ho2:d rxue)8vg39bpuj; 1the lamp88axrv bs: d9hp1u3u6 ;ig 2juyv)leo?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. We+ep )3qny;d yhat is the peak current through thepd3e)q yy;+ne resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120zltx4yni7f. li t mb,q2f9nfs22,*ww-V ac power supply. What is the power dissipated inzi2*2fn.tltf2 wq4l by7 fx,, wmsn 9i the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50no x69zj*rvt 6-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resit yqwy0o *xjl9 ,j)dz7stor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i.ni3xlx )b*tis $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-m,klsb 2 se;ef7llo9p)H inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil akyl:e5l 7o,s vt 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactance?d9 ac4 mgf1cr6

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reacxxw9m invf1s6pg ) (430p w k7xk:zoqctance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductorldq q2* ybi m3z9/yyd( when 120 V AC at a frequency of 20 kHz is appldm i2byqq(*z 39 yld/yied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.74c; v n;tir,hdr flbqw0 /)wr0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacit1h-c*xl:f yi qor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 /cw x; u-5wbt 2 tuuy;q wvpv*2(dcl,-v+ grmuW of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 Wvmuj ( 5fa0dxntj4n p6;wll* (b.l- fu?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF ckdlm1ux 8m* m-apacitor be 100 W l *x1dk8-mmum?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.wjt : -+u x w8nw,nzim5l/(dmm0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W zv (wmblzl (gjy71duq x;j556 inductive reactance, and 10.0 W cal;1md7 uw6(5xz 5gqv b zyl(jjpacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, af:q cy:1og 8kzfe/6 iqnd 1.0-mF capacitor are conegz /1ki86c:qfy:q ofnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1 br.))yfo t -mco+h m6y;8(bnnh.bphn.0-mF cmhn o)b(bn .f+ ;)8y borymn. pc-ht6hapacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connecte06fociwe /d5e jr n*d1w2 l8+ ,ddlnfvd in series with a 20-mH inductor, what is the impedance at 1000*dl 8n1r df cd+niel20wo6j,ef 5 dwv/ Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH tvto) bjjh xk 9dx+j5w*qw1 lmw ;*p5(-muk t8inductor, what is the phase angle at tdpx 5hob +(1vm-5mwjx;w*ut 8kwj*)l9k tj q1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH c h ac1mf0(+fdooil and 1.0-mF capac0+oad cm1(hffitor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed a/(/po6kr armnr *4binpi uadvhoo1y *n-7 88in series with a 100-W resistor and 15-mH coil to get a total impedanc4 r1-v8 uoahad6nopia/*n *p7or nr b(mi/k8ye of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for aw+ +v hqz24cbe total impedancw+ z qhcbev24+e of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in qltrt0t 81dy:series with a 100-kW resistor at 1.0-MHz for a total imp r8qt:td1t0yledance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the r r ixnmf)*efl04:3swimpedance at 1000 H m4)ifeswfnrr xl*3: 0z?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHh/dy 5/ifz h9epp2 ad,/pao:xz for a total impa:/ dp ye,hp /fh2i9/5za dpoxedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series b1h7j zxt*0ou with a 10-mF capacitor at 1.0 kHz for a phase aj7 z1xbh tu0o*ngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in so2o ox6 clu 8sp :ui9qr2)ig-djyn;)neries with a 30-W resistor at 1.0 kHz for a total impedance of 45 W?;8 nonqix)96i -l2:)jc osouy d2urgp

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF cap,b;izvjz5tot - (cq(: hyu5i qacitor at 120 Hz. What is the pha(uq- itqjvhoi( 5byzz t:5c ,;se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 1k ss;n w+wrp)d:1p xgq;kp0u*00-W resistor, 20-mH coil, and 1.0-mF capac ;ws+wr*;n:0kp udp 1)ps kqxgitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of o6 htu zgb 7.0x-p p2jtihj/5ta 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circui5t -hox / i2gpt tzhb6j.jp70ut is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of ca:yxm0n z8gax/p/;rl u pacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. nr0 x;zpm a/u/xygl8:What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing 4kd0w0n .p) knk wv+fia 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60- i 0n+)vdwwnk4.0kkfpHz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessarmx oau 9l9mv66y in series with a 500-W resistor for a phase angle of 9aml66v 9xmuo$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF.wqbw23 vlxg)0-0bq ykvu(v pehq6y * 0 At what frequency should the circuit be driven in order to have maximum power transw0vh6yly u0w0)3epv-qq2b xg(v *qkbferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power out xo:+3orgia.mt5.45onl6 h be fk)ozwput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected toh. o.zkltg ar3:5o )bo 6foeimw4n+x 5 a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC c wla-l0:msmg8 vhtw62 ircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has4/)ot-edk i 9rjp 9sml an impedance of 60 W and a resistance of 30 W. What is the podj)m4sioke9 tl pr/9-wer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circu6m .0ndas+t i9gzgz/j it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60mid +j/0snt gza96.gz -Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil ugj2,ogs5lx4,d 7h zt in series?4,o5tx2gjz, lu7 dh gs

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant frequlgijpcw cto,2.m*. ksj: 18m1cul*z w *wkz *pjmtllom:2c.juc8. iw s1gc,1ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH-gse w2 +l3rvp tvt)u4 inductor for a resonant frequenp-4tsuv g+ 2vl3)wertcy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 3s.0z7esx )xsv .7vyj4ipzkc. 0-W resistor and a 40-mH coil if the resonant frequency of thx zj c7) 0.47py.zsvkves.sixe circuit is to be 1000 Hz?

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