Commercial electric motors do not use


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 permanet magnet to rotate the armature id a soft iron on which the coil is wound.



Explanation : In commercial motor, armature rotates in the mag-netic field produced by an electromagnet. The strength of such magnetic field can

be increased to the desired value. However, a permanent magnet provides a fixed and weak magnetic field.

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