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Calculate the mutual inductance between ...

Calculate the mutual inductance between two coils when a current 2A changes to 6A in and 0.2 s and induces an emf of 20mV in secondary coil.

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`e= -M(dI)/(dt)`
`-20 xx 10^(-3)= - M (6-2)/(2)`
or M= 10mH
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