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Commercial electric motors do not use
(a) an electromagnet to rotate the armature
(b) effectively large number of turns of conducting wire in the current-carrying coil
(c) a permanent magnet to rotate the armature
(d) a soft iron core on which the coil is wound

Vinay

Solution: Answer is (c) a permanent magnet to rotate the armature

Electromagnets are used in place of permanent magnets in electric motors.