An emf induced in a secondary coil is `10000 V` when the current breaks in the primary. The mutual inductance is `5 H` and the current reaches to zero in `10^(-4) s` in primary. The maximum current in the primary before the breaks is

Options

A. 0.2 A
B. 0.3 A
C. 0.4 A
D. 0.5 A

Answer

A

Explanation

`e=L(di)/(dt)=5 ((i-1-0)/(10^(-4)))`