First slide

Magnetic flux and induced emf

Question

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

Moderate

A

150 V
B

170 V
C

180 V
D

190 V

Solution

$i = \frac{E - e}{R} \Rightarrow 1 .5 = \frac{220 - e}{20} \Rightarrow e = 190 V$

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