Question

Calculate the mutual inducatnce between two coils when a current of `2A` changes to `6A` in `2` seconds and induces an emf of `20 mV` in the secondary coil

Answer 1

`|e| = M(dI)/(dt)`
`20 xx 10^(-3) = M((6-2))/(2)` (or) `M = 10mH`