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 orge7*tj/i q -6t,k bqal(j 4v at the center of a s wm pr a/ c5m92ki (fxexhpl7j1.xs f1eo/z 2y:quare, and a second point charge of -Q is placed at x2e1f.owri(mh1s 7/ez:a9j p5xf 2 mlkycpx/the 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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