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  4. In a coil of self-inductance 5 henry, the rate of change of current is 2 ampere per second. The e.m.f. induced in the coil, is

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Q. In a coil of self-inductance $5$ henry, the rate of change of current is $2$ ampere per second. The e.m.f. induced in the coil, is

AIIMSAIIMS 1997Electromagnetic Induction

Solution:

Given : Inductance of the coil $(L) = 5 \,H $ and rate of change of current $\left(\frac{dI}{dt}\right)=2$ A/sec. The induced e.m.f.
$=-L\left(\frac{dI}{dt}\right)=-5\times2=-10\, V$