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  4. The average self-induced emf in a 25mH solenoid when the current in it falls from 0.2 A to 0 A in 0.01 second, is

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Q. The average self-induced emf in a 25mH solenoid when the current in it falls from 0.2 A to 0 A in 0.01 second, is

Electromagnetic Induction

Solution:

$e = L \frac{di}{dt}$