本题目来源于试卷: Physics Unit16: Electric Charge and Electric Field，类别为 国际高中通用物理
[单选题]
A point charge of +Q is placed at the center*i-3duvb) d ht of a ajf;g.,u5aqri52 s x.1l wx 8e5ylegw square. When a second point charge of -Q is placed at one of the square's corners, it is observlx8s;w 5f.aul xq j2a g5wy5ireg1e., ed that an electrostatic force of 2.0 N acts on the positive charge at the square's center. Now, identical charges of -Q are placed at the other three corners of the square. What is the magnitude of the net electrostatic force acting on the positive charge at the center of the square?
A. zero
B. $2.8 \; N$
C. $4.0 \; N$
D. $8.0 \; N$
参考答案: A
本题详细解析:
暂无
| 
