Coefficient of coupling between two coils of self-inductances `L_(1)` and `L_(2)` is unity. It means

The inductors of self inductance L_(1) and L_(2) are put in series .

The inductors of self inductance L_(1) and L_(2) are put in series .

The currents flowing in the two coils of self - inductance L_(1)= 20 m H and L_(2) = 15 mH are increasing at the same rate. If the the power supplied to the two coils is equal find the ratio of (i) induced voltages (ii) the currents and (iii) the energies stored in the two coils at a given instant.

Mutual inductance of two coils depends on their self inductance L_(1) and L_(2) as :

Mutual inductance of two coils depends on their self inductance L_(1) and L_(2) as :

A circuit contains two inductors of self-inductance L_(1) and L_(2) in series (Fig) If M is the mutual inductence, then the effective inductance of the circuit shows will be