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  4. When the rate of change of current is unity, the induced emf is equal to

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Q. When the rate of change of current is unity, the induced emf is equal to

Electromagnetic Induction

Solution:

Induced emf is equal to
emf $=-\frac{ d ( N \emptyset)}{ d t }=\frac{- d ( L i )}{ d t }=- L \frac{ d i }{ d t }$
So, when rate of change of current is equal to unity, emf is equal to coefficent of self inductance.