本题目来源于试卷: Physics Unit16: Electric Charge and Electric Field，类别为 通用国际物理
[单选题]
A point charge of +Q is plac fg5-p96yjk q74ocp 8iqr:un aed ati t*erv dn.1e4/4* 9d sv,7djigp q.q2tavgmb 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 fo 4*2/v pb7 *dg1v9as .drejietq i, v4ntgm.dqrce 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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