Question

In a transformer , the coefficient of mutual inductance between the primary and the secondary coil is `0.2` henry. When the current changes by `5` ampere//second in the primary, the induced e.m.f. in the secondary will be
A. `2500 V`
B. `25000 V`
C. `2510V`
D. `Zero`

Answer 1

Correct Answer - B
`e=-M(di)/(dt)=-5xx((-5))/(10^(-3))=25000V`