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 placed wop0s2t g9r p8 at the center of a square, and a s jj:1(gpl u3suecond point charge of -Q is placed at t 3 p1jujs:g l(uhe upper-left corner. It is observed that an electrostatic force of 2.0 N acts on the positive charge at the center. What is the magnitude of the force that acts on the center charge if a third charge of -Q is placed at the lower-left corner?
A. zero
B. $2.8 \; N$
C. $4.0 \; N$
D. $5.3 \; N$
参考答案: B
本题详细解析:
暂无
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