Electro Magnetic Induction And Alternating Currents Question 234

Question: The armature of dc motor has $ 20,\Omega $ 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=\frac{E-e}{R}\Rightarrow 1.5=\frac{220-e}{20}\Rightarrow e=190\ V $



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