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If the coefficient of mutual induction of the primary and secondary coils of an induction coil is 6 H and a current of 5A is cut off in `1//5000` second, calculate the induced emf in the secondary coil.

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`e= -M (dI)/(dt)`
`e= 6 xx (5)/(1//5000) V= 15 xx 10^(-4)V`
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