本题目来源于试卷: Physics Unit16: Electric Charge and Electric Field，类别为 国际高中通用物理
[单选题]
Two 0.20-g metal spheres are hrkg. (sa iy:m2 xvfx(7ung 8z y-;gqo1.x1b kqzfo from a common point by nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart until the angle between the q;qx.o1g1yo-k zfb 8zthreads 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:
暂无
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