Electromagnetic Induction - Result Question 16
16. A magnetic field of $2 \times 10^{-2} T$ acts at right angles to a coil of area $100 cm^{2}$, with 50 turns. The average e.m.f. induced in the coil is $0.1 V$, when it is removed from the field in $tsec$. The value of $t$ [1991]
(a) $10 s$
(b) $0.1 s$
(c) $0.01 s$
(d) $1 s$
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Answer:
Correct Answer: 16. (b)
Solution:
- (b) $e=\frac{-(\phi_2-\phi_1)}{t}=\frac{-(0-N B A)}{t}=\frac{N B A}{t}$
$t=\frac{N B A}{e}=\frac{50 \times 2 \times 10^{-2} \times 10^{-2}}{0.1}=0.1 s$
