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Question

A copper wire of length l is bent into a semicircle. It is moved with a velocity v in a region where magnetic field is uniform and perpendicular to the plane of the wire. If the strength of the field is B then emf induced


A
Blv
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B
Blπv
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C
B2lπv
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D
information is insufficient
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Solution

The correct option is C B2lπv
πr=l
or r=lπ,ε=B(2lπ)v

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