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Magnetic Flux and Faraday's Law

A coil having...

Question

A coil having n turns and area A is initially placed with its plane normal to the magnetic field B. It is then rotated through 180 $^{o}$ in 0.2 sec. The emf induced at the ends of the coils is

A

0.1 nAB

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B

nAB

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C

5 nAB

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D

10 nAB

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Solution

The correct option is D 10 nAB
Total change in flux = $△ ϕ = 2 n A B$

total time of change = $△ t = 0.2 s$

emf induced = $\frac{△ ϕ}{△ t} = 10 n A B$

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