The coils having self-inductance of 10 mH and 15 mH and ___

The coils having self-inductance of 10 mH and 15 mH and effective inductance of 40 mH, when connected in series aiding.

What will be the equivalent inductance if we connect them in series opposing?

A. 20 mH
B. 10 mH
C. 5 mH
D. zero

Show Answer

Answer: B

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