The mutual inductance between a primary ...

The mutual inductance between a primary and secondary circuit is `0.5H`. The resistance of the primary and the secondary circuits are `20 ohms` and `5ohms` respectvely. To genrate a current of `0.4A` in the secondary,current in the primary must be changed at the rate of

`4.0 A//s`

`16.0 A//s`

`1.6 A//s`

`8.0 A//s`

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