O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2023 · Q331 Mark

A commutator is connected to the coil of a d.c. motor. The commutator rotates and connects the coil to the power supply. Once every half-turn, the current in the coil reverses. What is the name of the commutator and what is the orientation of the plane of the coil as the current reverses?

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Aslip ring, parallel to the magnetic field

Bslip ring, perpendicular to the magnetic field

Csplit ring, parallel to the magnetic field

Dsplit ring, perpendicular to the magnetic field

✓ Correct answer

D: split ring, perpendicular to the magnetic field

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