PH-330
D.c. motor
Physics · Secondary 3 · Hard · D.c. motor
In a simple d.c. motor, the coil is horizontal and experiences its maximum turning effect. As it turns, why must the split‑ring commutator reverse the current when the coil is vertical?
- So the turning force keeps acting in the same rotational direction.
- So the magnetic field around the coil becomes stronger.
- So the coil can disconnect from the circuit and cool down.
- So the direction of rotation of the motor keeps changing.
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