The mutual inductance of a pair of a coil is 0.75 H. if the current in primary coil changes from 0.5 A to 0A in 0.01 s. the average induced emf in secondary coil is

Options

A. 25.5 V
B. 12.5 V
C. 22.5 V
D. 37.5 V

Answer

D

Explanation

Given : `M=0.75` and `(dI)/(dt)=(0.5-0)/(0.01)=50 A//s`
`therefore` Average induced e.m.f. in secondary coil
`e=M(dI)/(dt)=0.75xx50=37.5V`