16. A rectangular coil of $20$ turns and area of cross-section $25 sq.cm$ has a resistance of $100 \Omega$. If a magnetic field which is perpendicular to the plane of coil changes at a rate of $1000 tesla per second$, the current in the coil is (1992)
Solution:
Induced emf $e = N A \frac{dB}{dt} = 20 \times (25 \times 10^{-4}) \times 1000 = 50 V$.
Induced current $I = \frac{e}{R}$.
$I = \frac{50}{100} = 0.5 A$.
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