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]
Two 0.20-g metal spheres are hung from a co)pza)3 smu0rp fc4 cf9l*hh1 1r(u rfcmmon pointn56w(dqvd v0a0 q8 1jklqdyp( by nonconducting threads w06klvd q5 08npjy q(avddwq 1(hich are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart until the angle between the threads is $20^{\circ}$. How much charge was placed on each sphere?
A. $10 \; nC$
B. $15 \; nC$
C. $20 \; nC$
D. $25 \; nC$
参考答案: C
本题详细解析:
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