Networks Analysis and Synthesis - Engineering

Q1:

In figure the total inductance of the circuit is

A L1 + L2

B L1 + L2 + M

C L1 + L2 + 2M

D L1 + L2 + M

ANS:C - L1 + L2 + 2M

Inductances are in series aiding connection. M terms will become twice because of mutual inductance between L1 and L2 and that between L2 and L1.