7. 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
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option c) is correct ... because commercial motor does not use a permanent magnet to rotate the armature , it is electromagnet .....
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it is correct answer if it is not correct i don't know
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