Q.

The armature of dc motor has 20 Ω  resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be

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a

150 V

b

170 V

c

180 V

d

190 V

answer is D.

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Detailed Solution

i=E−eR⇒1.5=220−e20⇒e=190 V
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The armature of dc motor has 20 Ω  resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be