Electromagnetic Induction - Result Question 32
32. A rectangular coil of 20 turns and area of crosssection 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]
(a) $1 A$
(b) $50 A$
(c) $0.5 A$
(d) $5 A$
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Answer:
Correct Answer: 32. (c)
Solution:
(c) $i=\frac{e}{R}=\frac{\frac{n A d B}{d t}}{R}$
$=\frac{20 \times(25 \times 10^{-4}) \times 1000}{100}=0.5 A$
