Problem: Which of the following will cause an induced current in a coil of wire?a) the constant field of the earth passing through the coilb) a magnet resting near the coilc) a magnet being moved into or out of the coild) a wire carrying a constant current near the coil

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An emf is only induced by a changing magnetic flux.

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Problem Details

Which of the following will cause an induced current in a coil of wire?

a) the constant field of the earth passing through the coil

b) a magnet resting near the coil

c) a magnet being moved into or out of the coil

d) a wire carrying a constant current near the coil