First slide

Magnetic flux and induced emf

Question

Armature current in dc motor will be maximum when

Moderate

A

Motor has acquired maximum speed
B

Motor has acquired intermediate speed
C

Motor has just started moving
D

Motor is switched off

Solution

Motor e.m.f. equation $E_{b} = V - I_{a} R_{a}$
At starting $E_{b} = 0,$ so $I_{a}$ will be maximum.

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