A circuit contains two inductors of self inductance L1 and L2 in series as shown in fig. If M is the mutual inductance then the effective inductance of the circuit is |
L1+L2 L1+L2 -2M L1+L2 +M L1+L2 +2M |
L1+L2 -2M |
in this type of combination, L = L1+L2-2M |