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  4. The current in a coil of inductance 0.2 H changes from 5A to 2A in 0.5 sec. The magnitude of the average induced emf in the coil is

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Q. The current in a coil of inductance $0.2 \,H$ changes from $5A$ to $2A$ in $0.5\,sec$. The magnitude of the average induced emf in the coil is

KCETKCET 2020

Solution:

Average induced emf, $\epsilon= L dl / dt$
$=0.2((5-2) / 0.5)=2 / 5 \times 3=1.2 V$