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 hung from a common point by nonconducting t cdpp1;yz;b s)hrea)xv .mb 3lkgkh)u3 7bzds which arekx7bhgu .3bl3) k)mzv 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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