O-LevelPhysicsMagnetism5054/12 · May/June 2020 · Q391 Mark
A rectangular current-carrying coil is pivoted between the poles of an electromagnet. Which action does not, on its own, increase the size of the turning effect exerted on the coil?
Aincreasing the current in the coils of the electromagnet
Bincreasing the current in the rectangular coil
Creversing the current in the electromagnet
Dincreasing the number of turns on the rectangular coil
✓ Correct answer
C: reversing the current in the electromagnet
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