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Standard XII

Physics

Torque

A copper wire...

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

B l v

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B \frac{l}{π} v

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B \frac{2 l}{π} v

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Solution

The correct option is C $B \frac{2 l}{π} v$
$π r = l$
or $r = \frac{l}{π}, ε = B (\frac{2 l}{π}) v$

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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

The correct option is C B2lπvπr=l or r=lπ,ε=B(2lπ)v

The correct option is C $B \frac{2 l}{π} v$
$π r = l$
or $r = \frac{l}{π}, ε = B (\frac{2 l}{π}) v$