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]
An originally neutral electroscope is grounded briefly wh 0(v/h(:zwlhen 1ida hile a positrqz3 7:j5vur3d uxc+ om4zmf g1df /9jively charged glass rod is held near it. After the glass rod is removed, the xujdrf 4qm1m5c93r +ov 7 g /jdzu:3fzelectroscope
A. remains neutral.
B. is negatively charged.
C. is positively charged.
D. could be either positively or negatively charged, depending on how long the contact with ground lasted.
参考答案: B
本题详细解析:
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