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Faraday's law : If a "conductor" is placed in a "magnetic field" the movement in either conductor or field produces an induced emf in the conductor.

In generator the produced torque will be in AC(alternating current) so commutator or slip rings is used to produce unidirectional torque required for production of Direct Current.

Basically by Faraday law the produced torque will be always bidirectional,

for alternator the bidirectional torque can be used directly.

for DC generator the unidirectional torque is needed to produce Direct Current.

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