Solution: Answer is (c) a permanent magnet to rotate the armature
Electromagnets are used in place of permanent magnets in electric motors.
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
(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
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
(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