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If a current of 5 A flowing in a primary coil nullifies in 2 min, then induced emf is 25 kV. Calculate the coefficient of mutual inductance.

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If a current of 5 A flowing in a primary coil nullifies in 2 min, then induced emf is 25 kV. Calculate the coefficient of mutual inductance.

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Given, change in current (dl) = 0 - 5 = -5A
Time (dt) = 2 ms = 2 × 10-3 s
Induced emf in coil = ε = 25kV = 2.5 × 104 volt

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