The co-efficient of mutual induction between primary and secondary coil is `2H`. Calculate induced e.m.f. If current of 4 A is cut off in `2.5 xx 10^(-4) ` seconds.

Explanation

Here, the coefficient of mutual induction, `M = 2H`
Current of 4A is cut-off in `2.5 xx 10^(-4)` second.
Induced e.m.f., `E = M '(di)/(dt)`
`:. = 2 xx (4)/(2.5 xx 10^(-4))`
`:. E = 3.2 xx 10^(4) V`