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 cent )e2s3l +/+gvhaijkj b q,en2ter of a square. When a second point cjj3 sli/q +) nk +eav2b2h,egtvs0 v+puvrl5 xfvlkt6 q-5* x.harge of -Q is placed at one of the square's corners, it is observed 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 electrsx.-v 655lkvvpu r+txqf* v0lostatic 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
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