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Answer:
Why are they used:
A carbon brush is a sliding contact used to transmit electrical current from a static to a rotating part in a motor or generator, and, as regards DC machines, ensuring a spark-free commutation.
Answer:
A carbon brush is a sliding contact used to transmit electrical current from a static to a rotating part in a motor or generator, and machines, ensuring a spark free communication. Carbon brushes are also used in electric motors to provide a path for flow of current.
Explanation: