First slide

Faraday's law of Electromagnetic induction

Question

A small piece of metal wire is dragged across the gap between the poles of a magnet in 0.4 sec. If the change in magnetic flux is 8 x 10^-4 Wb, emf induced in the wire is :

Moderate

A

8 X 10^-3 V
B

6 X 10^-3 V
C

4 X 10^-3 V
D

2 X 10^-3 V

Solution

emf induced= $\frac{d ϕ}{d t} = \frac{8 \times 10^{- 4}}{0.4} = 2 \times 10^{- 3} V$

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