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  4. The mutual inductance between two coils is 1.25 H. If the current in the primary changes at the rate of 80 amperes/ second, then the induced e.m.f. in the secondary is

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Q. The mutual inductance between two coils is $1.25\, H$. If the current in the primary changes at the rate of $80$ amperes/ second, then the induced e.m.f. in the secondary is

Electromagnetic Induction

Solution:

$|e|=M \frac{d i}{d t}=1.25 \times 80=100\, V$