Question

Two inductors of inductance L each are connected in series with opposite magnetic fluxes. The resultant inductance is (Ignore mutual inductance)

• A. Zero
• B. L
• C. 2L
• D. 3L

Answer 1

Answer: (C)

2L

Answer 2

When magnetic fluxes are in opposite direction

$L' = L_{1} + L_{2} - 2M$

Ignoring M = 0

The resultant inductances is $L' = L + L = 2L$