O-LevelPhysicsMagnetism5054/12 · May/June 2016 · Q321 Mark

The diagram shows a simple d.c. motor. The switch is closed and the coil rotates. Which change makes the coil rotate in the opposite direction and at a faster rate?

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Aincrease the current in the coil and increase the number of turns in the coil

Breverse both the magnetic field and the current in the coil

Creverse the magnetic field and decrease the current in the coil

Dreverse the magnetic field and increase the current in the coil

✓ Correct answer

D: reverse the magnetic field and increase the current in the coil

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