The effective inductance of two coils with self inductances L1, L2 and mutual inductance M (as connected shown in figure) will be:
F2 Vinanti Engineering 21.07.23 D1 V2

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
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  1. L1 + L2 + M
  2. L1 - L2 - 2M
  3. L1 + L2 + 2M
  4. L1 + L2 - 2M

Answer (Detailed Solution Below)

Option 3 : L1 + L2 + 2M
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Key Points

 Whenever more than one inductors come in closer, there may be mutual induction between them.

If more than one inductor is connected in series and the flux of one inductor links the other, we have to consider mutual inductance during equivalent inductance calculations.
F1 Madhuri Engineering 19.12.2022 D37

If a circuit contains two inductors of self-inductance L1​ and L2​ in series as shown in the figure. If M is the mutual inductance, then find the effective inductance of the circuit shown.

Leq = L1+L2 +2M

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