The armature of a DC motor has resistance

PHYSICS · Single correct · GCSE · Physics · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

The armature of a DC motor has

20\ \Omega

resistance. It draws a current of

1.5\ \text{A}

when run by a

200\ \text{V}

DC supply. The value of back emf induced in it is (a)

150\ \text{V}

(b)

170\ \text{V}

(c)

180\ \text{V}

(d)

190\ \text{V}