MHT CET 2022 Physics question

Two coils of self inductance 1 H and 3 H are connected in series. Their mutual inductance is 5 H. The self-inductance of the combination is

(A)10 H
(B)28 H
(C)14 HCorrect
(D)40 H

Answer: (C)

Solution

For two coils in series, the equivalent self-inductance is , the plus sign when the fluxes aid each other and the minus sign when they oppose. Taking the usual aiding connection: H, option (C). With the opposing connection

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Question ID VK-094228