O-LevelPhysicsMagnetism5054/12 · Oct/Nov 2014 · Q321 Mark

The diagram shows a d.c. motor with its coil horizontal.. Why is a split-ring commutator used?

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Ato change the current direction in the coil as the coil passes the horizontal position

Bto change the current direction in the coil as the coil passes the vertical position

Cto change the current direction in the d.c. supply as the coil passes the horizontal position

Dto change the current direction in the d.c. supply as the coil passes the vertical position

✓ Correct answer

B: to change the current direction in the coil as the coil passes the vertical position

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