本题目来源于试卷: Electrostatic Force and Electric Field，类别为 美国物理杯赛(Physics Bowl)
[单选题]
94.08: A point charge of +4.0 μC is placed on the neg w.e:8 r 3zdvppative x-axis 0.20 yye khq4 evyeyrp 3o97( 8el.q7uek;) m to the left of the origin, as shown in the accompanying figure. A second point charge q is placed on the positive x-axis 0.30 mto the right of the origin. vryy9)y koe.(348hy7ee leqe; 7uqpk The net electric field at the origin is zero. What is q?
A. 9.0 μC
B. 6.0μC
C. 0
D. −6.0 μC
E. −9.0 μC
参考答案: A
本题详细解析:
暂无
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