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 copper penny has a mass ofi2 p4 zgucs0,mue8l3dh/ jfs9 3.b v:v. sv dbc -erk6ho-lx.(r:0 g. A total of $4.0 \times 10^{12} \; electrons$ are transferred from one neutral penny to another. If the electrostatic force of attraction between the pennies is equal to the weight of a penny, what is the separation between them?
A. $31 \; cm$
B. $33 \; cm$
C. $35 \; cm$
D. $37 \; cm$
参考答案: C
本题详细解析:
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