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Magnetic Flux and Faraday's Law

placed in mag...

Question

A coil of square shape $(4 m \times 4 m)$ is placed in magnetic filed as shown in the figure. Find induced emf in loop.

A

32 volt

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B

8 volt

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C

16 volt

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D

zero

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Solution

The correct option is D zero
$e m f = - \frac{d ϕ_{B}}{d t} ϕ_{B} = \to B . \to A = B A cos θ$
$= (2 t) (16) cos 90$
$\to B & \to A$ are perpendicular
$ϕ_{B} = 0$
$e m f = - \frac{d ϕ}{d t} = 0$

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