In a DC motor, which statement about the commutator is true?

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Multiple Choice

In a DC motor, which statement about the commutator is true?

Explanation:
Reversing current in the rotor windings as the rotor turns keeps the torque in a single direction. The commutator does this by being mounted on the rotor and rotating with it, while stationary brushes press on its segments to supply current. As the rotor turns, the brushes contact different segments and reverse the winding current every half turn, so the magnetic forces continue to push in the same rotational direction. Because of this, the commutator must rotate with the rotor, it isn’t stationary, it isn’t made of wood, and it is indeed used in DC motors.

Reversing current in the rotor windings as the rotor turns keeps the torque in a single direction. The commutator does this by being mounted on the rotor and rotating with it, while stationary brushes press on its segments to supply current. As the rotor turns, the brushes contact different segments and reverse the winding current every half turn, so the magnetic forces continue to push in the same rotational direction. Because of this, the commutator must rotate with the rotor, it isn’t stationary, it isn’t made of wood, and it is indeed used in DC motors.

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