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MHT CET 2025 (23 Apr, Shift 2) · Combination of Inductors, LR & LC Circuits

Combination of Inductors, LR & LC Circuits question from MHT CET 2025 (23 Apr, Shift 2)

Q14MHT CET 2025 · 23 APR · SHIFT 2Medium

Combination of Inductors, LR & LC Circuits

Two identical coils of inductance $L$ joined in series are placed very close to each other such that the winding direction of one coil is exactly opposite to that of the other. The net inductance is

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Answer: (c)

Series coils with opposing flux: $L_{eq} = L_1 + L_2 - 2M$
Placed very close (perfect coupling): $M = \sqrt{L\cdot L} = L$
$L_{eq} = L + L - 2L = 0$
So the answer is (c) zero.

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