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题目
题目

APPHYSC142-031 with labs Exam Review - Final

单项选择题

A bar magnet is passed through a coil of wire. The induced current is greatest when

选项
A.the magnet moves slowly, so that it is inside the coil for a long time.
B.the magnet moves fast, so that it is inside the coil for a short time.
C.the north pole of the magnet enters the coil first.
D.the south pole of the magnet enters the coil first.
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标准答案
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思路分析
When evaluating the induced current in a coil, the key factor is the electromotive force (emf) generated, which is proportional to the rate of change of magnetic flux through the coil. Option A suggests a slow, extended passage, which would produce a slower change in flux and thus a smaller ......Login to view full explanation

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