Question

Question 6
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​​​​​​​

Answer 1

Option (c) is correct.
The commercial motors use:

(i) An electromagnet in place of permanent magnet
(ii) Large number of turns of the conducting wire in the current carrying coil
(iii) A soft iron core on which the coil is wound.