Question

An average induced e.m.f. of `1V` appears in a coil when the current in it is changed from `10` `A` in one direction to `10A` in opposite direction in `0.5` sec. self-inductance of the coil is
A. `25mH`
B. `50mH`
C. `75mH`
D. `100mH`

Answer 1

Correct Answer - A
`|e|=L(di)/(dt)impliesI=(Lxx{10-(-10)})/(0.5)`
`impliesL=25mH`