Electro Magnetic Induction And Alternating Currents Question 234

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 [MP PMT 1999]

Options:

A) 150 V

B) 170 V

C) 180 V

D) 190 V

Show Answer

Answer:

Correct Answer: D

Solution:

i=EeR1.5=220e20e=190 V



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