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The average emf induced in the secondary...

The average `emf` induced in the secondary coil is `0.1 V` when the current in the primary coil changes from `1` to `2A` in `0.1 s`.What is the mutual inductance of the coils.

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The correct Answer is:
A
`EMF=|M(-DeltaI)/(Deltat)|` or `M=(EMF)/|(-DeltaI)/(Deltat)|`
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