本题目来源于试卷: Electricity and Circuits: Capacitors，类别为 美国物理杯赛(Physics Bowl)
[单选题]
02.39: A parallel-plate capacitor is cw) egutr(7vsd 7na2:xv9 dby0onnected to a res ctn(ucfqme7os3*g5t-)z* 0vxb)u jcistanceless circuit with a battery having emf E until the capacitor is fully charged. The battery is then disconnected from the circuit and the plates of the capacitor are moved to half of their original separatmfvs30 -j5t7bue cq)ccnt(uxzo * )g* ion using insulated gloves. Let $V_new$ be the potential difference across the capacitor plates when the plates are moved together, $V_old$ be the potential difference across the capacitor plates when connected to the battery. $V_new/V_old$=?
A. 1/4
B. 1/2
C. 1
D. 2
E. 4
参考答案: B
本题详细解析:
暂无
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