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4 September, 22:48

In which case is there an induced electromotive force?

A. A permanent bar magnet is held inside a coil of wire

B. Field line's from earths magnetic field cross the area of a coil of wire

C. An electromagnet operating on direct current is held a second coil of wire

D. An electromagnet operating on alternating current is held inside a second coil of wire

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Answers (1)
  1. 5 September, 01:42
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    An electromagnet operating on alternating current is held inside a second coil of wire. (C)

    I just took this test. That is the answer.
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