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]
An originally neutral electroscope is grounded briefly +p ;snvr1ehq al(fip5vv00uwm3jf, 1w+j t2w:--xl. v;amg1ewz pw txhile a positively charged glass rod is held nevle +2a -;:mw1tgj wz xt.w-pxar it. After the glass rod is removed, the electroscope
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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