Question

1) Carbon brushes are used in electric motors to​

Answer 1

see the picture

hope it helps you ☺️

Answer 2

SEE THE ATTACHMENT-#1

IN DETAIL-

play an important role in motors and generators,

serving as electrical conductors. This is achieved by passing electrical current between the motor's stationary and rotating wires. A carbon brush may have one or more carbon blocks and one or more shunts or terminals.