First slide

Magnetic flux and induced emf

Question

A coil of area 100 cm² has 500 turns. Magnetic field of 0.1 weber/metre² is perpendicular to the coil. The field is reduced to zero in 0.1 second. The induced e.m.f. in the coil is

Moderate

A

1 V
B

5 V
C

50 V
D

Zero

Solution

$\begin{array}{l} e = - \frac{N (B_{2} - B_{1}) Acos θ}{Δt} \\ = - \frac{500 \times (0 - 0 .1) \times 100 \times 10^{- 4} \cos 0}{0 .1} = 5 V \end{array}$

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