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Calculate the equivalent inductance when two inductors are connected in parallel of values 12 H and 12 H.

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Calculate the equivalent inductance when two inductors are connected in parallel of values 12 H and 12 H.

(a) 6 H

(b) 10 H

(c) 12 H

(d) 8 H

This question was addressed to me in unit test.

Enquiry is from Regenerative Braking of DC Series Motors in division Braking of DC Motors & Induction Motors of Electric Drives

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The correct answer is (a) 6 H

The explanation is: When two inductors are connected in parallel their equivalent inductance is equal to the harmonic mean of the inductances. Leq=L1×L2÷(L1+L2)=6 H.

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