The coils having selfinductancs 10mh and15mh,effective inductance 40mh when conn

The coils having selfinductancs 10mh and15mh,effective inductance 40mh when connected in series aiding. what will be the equivalent inductance if we connect them in series opposing?

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The coils having selfinductancs 10mh and15mh,effective inductance 40mh when connected in series aidi..

Answer / sethu

L = L1 + L2 ± 2M.
When ordinary, L = L1 + L2 + 2M
∴ 40 = 10 + 15 + 2M.
∴ 2M = 15 mH
When opposing, L = L1 + L2 – 2M
= 10 + 15 – 15 = 10 mH

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