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In a d.c. electric motor, the function of the split-ring commutator is to
AGenerate the magnetic field needed for the motor
BReverse the current in the coil every half rotation
CConvert d.c. supply into a.c. for the coil
DIncrease the voltage supplied to the coil
Answer & Solution
Correct answer: B. Reverse the current in the coil every half rotation
1. The chapter describes the d.c. motor.
2. Without reversal, the coil would oscillate, not rotate.
3. The split-ring reverses current every half turn.
4. This keeps the torque acting in the same rotational sense.
_Source: Selina Concise Physics Class 10, Ch 10 Electromagnetism (Mistral OCR'd PDF), section on dc motor_
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