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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 magngjo46vx2mjnj.r /pgu 6fqj4 4etic flux 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 statek g+w)o cwx9:3 q.brras that 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 produce tpjdmngg8-4*8zae * od* +vbjs what kind of change on the inducedpvbat 8*do+*ggnjmze*d8 4-j $emf$, 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 msstui)b0v, j)rgw ;d b..p 4zhagnetic field through a loop of wire produces what kind of change on the indusri.,b;ujp)d4shtg0v z . wb)ced $emf$, 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 vc -ipp;22/1uknt5g vn+s ee gxf 1tq*produces what kind of change on the induced vc2kuf-vip p 5s;2t1nq/ gg 1nte*ex +$emf$, 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 magn i*1ogi5. iv):t5gtpx rx,xk setic 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 induced current in a conducmk* 8y ggjjw-)tor will be that which tends tj-k*y8mg)gj w o 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. A bar mbmypvz3t0ks59)yhg.yy 4 p ;yme4rq ,agnet is held above its center with its north pole pointing dp9p qm3),gy.;y r0bh4kyey yvszt4 m5 own. The stationary magnet induces (when viewed from 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 hordz5qu z rb,i7:izontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the uzdzi5,br q7 :falling magnet induces (when viewed from above)

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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 in a region where the mag6rb; oy65zvgunetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what56ro bgu ;vy6z is the sense of the induced current in this coil as 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 lev )toesp:p5u0oel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows so:oet5us p0p)tronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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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 mamr9j+ 9*asibe gnetic field points straight down. The magnetic field disappears suddenly. When vjmb+sa9ier9 *iewed 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 horizontal table and carries an ever-we z2s5(kido,z6li vhil5y6 11mg5ftincreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from dio1 ,lzw2l (1ysitvk5 he556zgi6fm 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 eq0q joawpy: 084)3 o:nar pmqwntering first. As the north pole enqy:ompw ra)0 q0 48:3awpqojnters 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 speed about an axikya3. 2qe8 twiq qbwwe377ia:eom h*.s whose direction can be varied. In a region where a3k2 em wowb. h7 8aq73*q.qiteywa i:e uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ 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 s ;h/ :i 4tal3q9zp7c8ym7m3ejvlcik gpeed 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 axck97:eqmlz7gi/h 4t3m y pjvl 8a; i3cis 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.x6se7qlq6w4 n
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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 that mdteb3,h 3px9 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 mag)7oog;;a7z7 9d -xee+n cj inrgdrq0(vgq wc9netic 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-west dirgz-((ie8ge)7 cbp agjfr9 2qeection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statggf iera8g9c pjb2e()7 z (e-qement concerning the potential induced 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 velg6mu7+p 8uza yzad 5.9v plrt2 sk6q3wocity $\omega$ 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 generator transfojcg6o1/ b,24 gfzvm ebrms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates1f1blo+yw .rt through 60 revolutions each second. The frequency of the.rft1y1 ow l+b $emf$ 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 device used t *5pe9:srqw by n2dww:a/yl1uo

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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 devic hubwfb* ,g et.3zwmig7o 3*3me that

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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 conta0xw 3qabep dp5l:c*-rins more loops than the primary coil then i q*wp 3lrbxae5c:-0 dpt is a

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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 loops thr4zf9e4b,uk1 6ut1 gqhe:toitn+ qe 7an the secondary coile 9tuufett1:qhn r,b+e 74 g1 qoiz6k4 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 powernu2bo- k8z6dmjtna4 ) input

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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 circuit, l/ niwlq63+sj cpa6,8bt:wth-vt(ls

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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 5 ur(yquhh(t1ideal battery of constant terminu(r5 uy th(hq1al voltage. At the 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 series to an ideal ba mhri555ck( brttery of constant terminal voltage. At the moment contact is made with the battery, the voltmrc ihr(555kbage across 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 inductanchk8x .wecli4rh80 1a oe 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 withj cb;qh1xj.-u 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 ba-,tyu7 rfc6 0r s(ytbjttery. The time constant for the circuit represents the time byc s,r0 t-7f6y rj(turequired for the current to reach

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 indp0m5eny qn*6 jt rmf0-uctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circ65pe mryf*j0tqm n -0nuit represents the time required for the current 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 lqp + .kriqw+ovsxpg3074 lxs 3w). pkrf0y;b the same units 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 vmg;78u(7: alrgaphnx lv;-tf:-pb tto an AC power supply. On this circuit, 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 supplyqllcn03e9b0 /o1 i2faweq h .x. In this circuit, the currenta9qxlq3f lee/i01co.h w n0b2

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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 changes by what factor when the 2x(c j akpr234n /uapafrequency is trip3xprnjpc/2ua k 4a(2 aled?

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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 is doubled, th/nxf8z *cmn79w(bzz he inductive reactance of thatc*(zh8zz7xwbf nnm9 / 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, -.n5v rkaa( 9bv pqn.ethe inductive reactancvepqba9-. an n5 r(k.ve 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 to ann cf 27yxi5h:rpl( vm pm3no+/ AC power supply. In this circuit, the currencvy+3 7m nlrn5 2:/xp mfi(hopt

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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 the fqj/t3yjcv 8 f7requency is tripl /v qjy7j8c3tfed?

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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 capacitor approaches zero, the cq 4)39don iixju 9v qcee8v:/jb(*hsxapacitive reactance i8o9q j:v(v eqi) xjh4xnc* es9d b3/uof 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 between c,,b ibvah +uwl5zi5ak5(5 xuthe voltages of the inductor and capacitor in a RLC series circuit+ukaawc,55b5xu( il,v zh5i b?

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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 cir2)ch6l47e m.uetmd jdcuit is defined 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 circ9a y4ax*wjn :puit. The impedance of the circuit increases if R increases. When is this statement truepja*n x:w9a y4?

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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 impedan,)grlo/8x-b pa uwcz *ce of the circuit 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 circuit. The vtn)-m3n y qj.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 c qu9 y:tbgh74rapacitance both double in an LRC series circuit, the resonant frequency of thatuh4 rq9:7b ygt circuit 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 anue- wny z)h 4(nxbj4 5oj.fuq8 AC applied voltage. At resonance,

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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 Rs9cpj zi908 jcLC circuit 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 0.2qk9uhhol m;6 ,f9oo/br r4 jg)0 T. Find the magnetic fg 4mokrohr)9bhoj; 9luq6/ f, lux 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 0zm o 314evtzsa uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wme s3z v014ozthen 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 uniform magnetic field of 0.c-n 4sa8(diub 20 T. Find the magnetic flux through the loop when the u da(c4n8bsi- plane of the loop and 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 a7aow u6k jyml. .t6xieq/s01w n adjustable 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 coil change 7zz3b0x,+7)tdnp 3 oz shqbmts 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 turnsl lw.wx:z*bf qqz-6 .j of wire on a square frame with 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 8.0 s, find the average value of the inducedwxq.blfw:-lz 6j * z.q $emf$.

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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 withixzq(rge1jz79y)ze 6ice s-9 15 turns 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 and a(drozu5 9ih y;qpj1g9rea $0.20 \; m^{2}$ 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 horizontally ao.i l/kph0cd; t a location where the downwarl kdih.;c/0 pod component of the Earth's magnetic 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 i 6dr3)xsdvo1 *)iptqx s 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in aq *3roxis)6)1tv ddpx 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 z 9*f7koi; r nh2nb*0ausxw-cand a cross-sectional area 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 of 100 turns o:)fhohq3u x::;mej s rf 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. efzn*mn /ce*g r4t(j: Each loop 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 uniform magnetic field of 0.30 T, which iszntg:j ce e*(4f/nr*m 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 of wire of2b pjg3d* etz s pf ll.8c5iay9zg,-c3 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 with an outpn : caoirsxl;)mz u h;.j,uyg63d;2abut of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatin;b a aju; 62xlghoir :z,s3dy.unm;)cg 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 a maximum fejg-8(j ++e ve6pohg$emf$ 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 have*v6z3ez2:s ftq qpf0l 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 are, jd-kxd7 ux+7b:y un 5lc+o resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it genera, uc by++x75ujekx drndo:7-ltes 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 internaloj0/.v 7gr ipa resistance 6.0 W is connected to a 24-V power supply. The operatina.por7 iv j0/gg current is 1.0 A. What is the 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-Vr *1 vjc mh(,wpw0qi(p power supply. The operating current is 1.0 A at full speed. What is the ba,1p*vprh( mw(cw 0ijqck $emf$ 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 resistance 6.0 W is connected to a 24-V 02l*8vw7 (w iq )qiuuorqcax4 power supply. The)q u rli2a0qc4qwuv*8 i w(xo7 operating 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 redu/rgetp xi m0h xgqj1f ::m+f9.m r)ef(ce a primary 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 flow in the seconlc3 :mg is*:6ew 1lxcu-xd.tydary.dstxxumyc*6g -3 lcwi:. e 1:l 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, how man1-e1jpn l /ukwy turns are necessary in a 110-V primary if the 24-V secondaryep lj/wn 11ku- 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 consis2 e1r8ird-yp zts of a 500-turn primary coil and a 2000-turn secondary coil. If t-ezd8rrp1 2yihe current in the secondary is 3.0 A, what is the current in the 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 p2nda1 kr e;9ui ws2i2primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the swkansird2; u1p 2i 92eecondary?

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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 provid q,aiq4;dq1f kes 7500 V at 10.0 mA. The primary coil operates on 120 V. What, idfkqa;4q1q does 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 primas6ubvz. 8:n1sh7l/gbpkyd y*ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tyn ks zb *p/y8h.:g7vdl s1bu6o 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 oymxn) f+o;2xw n its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sw f;+ x2yonmx)econdary?

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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 tran72ys dj5rhrtn26x *vg c,4m ldsformer has 100 turns and its secondary has 200 turns. If the input current at the primary i,5smtx 2d*gvy crdj 74nr26hls 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 secondary has 200 turns. Ivra+q: nb iecm- (v7(df the input voltage to the primary is 107qnr (+medbv:iac (v-0 V, we can 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 has 200 turdpwdbp 2/4 8orns. If the power input to the primary is 100 W, we can ex2pp odr/wbd4 8pect the power 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 jnpy 0p9 sy66s120 V. The voltage 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 hssp 06pyy 6n9jas 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 current at 120 V. The voltage is urp+xgj ncm9 ;.sually stepped up to 4500 V by a transformer and transmitted through a power line .j9; r+xm pcgnof 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 /cltrf( br+9yat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powe fb(l 9tyc/+rrr 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 line 50 km /u laqy 5ufcha+-5ub-ajz7x) long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce e)/ ajy7cu-aa b- u+ lq5fhxu5znergy 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 would 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 5 -h) nix/5 s1w 0xjt)likema:vxmv /o00 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-i/1o:)5iw mx ex nsh00vma )l/xtkvj 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 power wohqlrehvhfb luh15hz ueny ,,/1,*) xa3n ow7+uld be lost if the power were transmittnh17 w1/ qaben*h3) lvx hfy+ u hz,,uelro,5hed at 3000 V instead 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 lin0z jf9k;z+up gv* t6fo10amhjvj0jw: e with resistance of 0.60 W. To what voltage must the generator w0 vv 6jjt0;9zj:fho1j+ zp0k*amfgu output be stepped up with 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 i fo 9gcu kh,dy+a.gmm-ztz(jv *0-w(on the coil's magno aym.*th(9m(-djcku0 ozv gg,zw-f+etic 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 inductor. :w8gcxzsx 7b 7What is this circuit's time cos7: wxc7bz gx8nstant?

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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 where the rms voltage is 12vaw ;gz2c6d )r0 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 into22hl( *xxy ch3edq2nv a 120-V AC outlet. What is the peak current?

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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 A1uz8um .d1kfgC outlet. What is the resistance of the lamk d.z1ufm18 gup?

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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. What is the peak cuhw2d 20p 4bbjlrrent through4 20wphjl 2bdb the 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 120-V ac power supply. Wh8pojzc 2 ,r p.fvpwphf:9zfv, :efh ix70zi7+ at is the power dissipf,fv7z2h.zp z 9:r 0vpihf ,c8wi:fe+pxopj 7 ated in 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 5v alm3w:,wbf 80-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 rfg3: u*x,vant9p cd0resistor 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 resisto+3xkddskprtt9c jao-h 9 8)a.r is $I = 0.80 \sin (240 t)$. 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-mH inductor at n- ( ub)wtotl(j0:g ma60 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 at 1000 Hzr34m/ps + rgfd?

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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 reac496j1ga w tcl,5w7dcaf8 itrytance?

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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 reactance at 104 adr96efqp f800 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 inductor when 120 V AC at a frequency of 20 kHzg3gfifulm4laawr:6z v/:qb.w 6l:k6fg ,tx. is applied t4u fv.f36:awi l gma, b ./kq:6lfg6zxltr:wgo 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, 60.0 Hz soub8th v6e6gqdu3 2u )x,zebu x9fkl;0 8rjpid/rce?

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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 capacitor at-)70 m7 bs/gdpfkxj 1(r 4ltsbs3rbvu 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 W of capacitiveto/e:/7 ;y5envsuu wa 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 W4:1gvip(r -x* leunkz ?

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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 capa cvdk7,ctj*8jruq)z *citor be 100 W?tv)*dqj8ck*rujc z, 7

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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 0.0010-mFdw-ar e8,k ncbupvbys8 e91 a5pq45 (n 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 resistanc,4:zsig,g ,hq/tbdtz i dbb: 7e, 15.0 W inductive reactance, and 10.0 W capggbibzddthi7,:q 4/bzs ,:t,acitive 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 resistorqb+r2x aw(4q g, 20-mH coil, and 1.0-mF capacix+(w2b4qqrg a tor are connected 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 angle0r 6xbkdf//fi u sy/)d,ap( kh at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series rdp,hdkfx/f a i/)/y6bsuk (0?

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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 conn8qp7* pim wwgwr/5isuu /y) a*ected in series with a 20-mH inductor, what is the iw 7) smgpp*rwwu /ai/u8y*qi 5mpedance at 1000 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 ih();yzkm yg0(aua *8w0p hkfconnected in series with a 20-mH inductor, what is the phase angle at 1000 Hz?z )0(8wkpih0 guhy*(yakfm; a

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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 coil and 1.0wxt mu8b0hg 7(-mF capacitorx7g uwtbh 8(m0 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 neerc w)6:o7yc jfc1/pq /)h nl; zapy3fnded in series with a 100-W resistor and 15-mH coil toa r /lp1:ywnqzncj)6 c3/;f 7)ohfpcy get a total impedance 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 puil+ c,,nw zi07 u+pjgvt in series with a 450-mH inductor at 5000 Hz for a total impedance giu+cinjvp0zw l,,7+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 series with a 100-kW resistor at 1.0-MHz for a t/ps5umkpc 1z,9x svxv*.oa / votal impeuso,*zvc1 mpa p/vxx/ 5vsk.9dance 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 r7j o 0qw(edcg(a2jyl929az aa 20-mF capacitor. What is the impedance at 1000 Hz?z9agq 0o2 a (rl7aey 2(wcdjj9

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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 krb.sgkuo3e59k1x n8 a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W? gksbn. o3u1exkk9r5 8

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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 with lqv0hzag8)* g e.tm,1bp tj4n a 10-mF capacitor at 1.0 kHz for a phase angle tevj0.n g)*m4b, q p1tal8 hgzof $40^{\circ}$?

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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 series with a 30-W resistor at 1.0 kHz for a 0d i-7 cmp(-fdik(dd vbd/rz:total impedance o-fc(ivm/d- 7(kz0 pridbd dd:f 45 W?

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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 capacitor at 120 Hz. What 98korov8bjc3t4eu /r9val o0 is the phaa8lou3 /b vrveot or98 04kj9cse 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 if1 c5yr3dlufzynue tn)d w9* ,* a 100-W resistor, 20-mH coil, and 1.0-mF capatl uwyy d,5nz3u* rfe1)*c9d ncitor 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 a 1tp*to+.dwve9 8fs,,vf. qzjx 00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The wt+,8ffs.pv *9xez,jv ot.qdcircuit 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 c:ab z7b5bg6 zbfyv :4qapacitor of capacitive reactance 30 W, and an inductor of inductive re 46a vq 5yb:bzzg:f7bbactance 30 W are connected in series to a 110-V, 60-Hz power source. 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 a 50-W relzcuoc,e. yz5ob 80 3bsistor, a 10-mF capacitor, and a 0.45-H inductor, when c0l.zu,83bce ocby 5zoonnected to a 60-Hz 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 necessary in series with a 500-W resistor for a phase z vk *vj 6hht/e)c4f whbu)q98rm-6ii angle oteibiv m*9q 86v6 zkjh rhwfh4uc-/))f $40^{\circ}$ 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 = 202aw* l w(/laqh25.pp d 3lblro0-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivinowpa l 3la rlp*(hdq5./wl22b g 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 output in an ac series circuit with 12.0 W resistance, 15.0 yxf (n , p3d*oxo5p3tmW inductive reactance, and 10.0 W capacitive reactance, when the circuit is co3oyd 5pxn,otp(3fmx*nnected to 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+we6s/nm.n+j97 5 8b8dkdgjuzhm ne y AC circuit 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 has an impedance of 60 W and a resistance of 30 W. bh/+,sj/ zhedWhat is the powerjhs/ +/,zd ebh 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 factl,yhr jjhpexk2g.24jjo: u 8:or for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-4xjhh :.jygjlo22jr8ek p:, uHz 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 p,b w161qp 3f/mllcfxnfu:w4 15-mH coil in series?l3,plbuc 1mf6pxffw4w 1nq :/

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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 cgyhw qqkb-xm:7 sax 2;3cz,0oapacitor for a resonant frequency of 10 kH:k7omxg3y h -qa w x;zq20cbs,z?

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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 8 d.ju wki8.n84atooain series with a 3.7-mH inductor for a resonant frequenaadwki8 8j4 otn .8o.ucy 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 i ,,cnv(leb b6vn series with a 30-W resistor and a 40-mH coil if the ,cl6en bb(,v vresonant frequency of the circuit is to be 1000 Hz?

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