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 pl )t 1 i+n1pn5hsg3lxbaacendy7: ozy1 jios45ixf9 4v 1eid 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 electro1e7vi4 yni zi49jo:y 5 x1osdfstatic 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
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