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题目
题目

PHYSICS 1201 SU2025 (10585) Quiz 5- Requires Respondus LockDown Browser

单项选择题

A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil, and itis  steadily changing. Under these circumstances, an emf ε is induced in the coil. If the rate of change of the magnetic field and the number of turns in the coil are now doubled (but nothing else changes), what will be the induced emf in the coil?

选项
A.It remains unchanged.
B.ε/4
C.ε/2
D.4ε
E.2ε
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标准答案
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思路分析
To analyze the induced emf, recall Faraday’s law in its simplest form for a single loop: ε = -N (dΦ/dt). When the magnetic field is perpendicular to the coil, the magnetic flux Φ = B A, so dΦ/dt = A (dB/dt). Therefore, ε = -N A (dB/dt). Now apply the changes described: the rate of change of the magn......Login to view full explanation

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