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 plh9( fvo2ahq* iacydtg.7y l*s.fk8,hbc- 5pg7h e ie rl:ed at the center of a square. When a second point charge 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 electrostatic forcep.fh7-ckbls8 rtey ig5,7*hged .l:y 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
| 
