Question

Two coils A and B having turns 300 and 600 respectively are placed near each other, on passing a currentof 3.0 ampere in A, the flux linked with A is 1.2 x 10-4 weber and with B it is 9.0 x 10-5 weber. The
mutual inductance of the system is :-
(1) 2 x 10-5 H
(2) 3 x 10-5 H
(3) 4 x 10-5 H
(4) 6 x 10-5 H
Just need a formula

Answer 1

Answer:

2. is the correct answer

Explanation:

see the attachment please