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Solution


Q.

Commercial motors do not use
1 an electromagnet to rotate the armature  
2 effectively large number of turns of conducting wire in the current carrying coil  
3 a permanent magnet to rotate the armature  
4 a soft iron core on which the coil is wound  

Ans.

(3)

Commercial motors do not use permanent magnets because they are weak and do not produce strong magnetic field in the region.