## In This post you will get answer of Q.

Current in a coil changes from $4 ,A$ to zero in $0.1$ second and the emf induced is $100, V$. The self inductance of the coil is

Solution:

## Induced emf , $e =frac{-L d I}{d t} $

$therefore 100 =frac{-L[0-4]}{0.1} $

$Rightarrow L =frac{100 times 0.1}{4} $

$=2.5 ,H$