O-LevelPhysicsMagnetism5054/12 · May/June 2023 · Q321 Mark

A coil of wire above a magnet is dropped. As the coil falls over the magnet, an e.m.f. is induced across the coil. What does not affect the magnitude of the e.m.f. induced across the coil?

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Achanging the number of turns of wire in the coil

Bchanging the height h from which the coil is dropped

Cchanging the direction of the magnet, so the north pole is at the bottom

Dchanging the strength of the magnetic field from the magnet

✓ Correct answer

C: changing the direction of the magnet, so the north pole is at the bottom

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