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A glass rod of length l with resistance...

A glass rod of length l with resistance R lies in a constant uniform magnetic field rB perpendicular to the rod. The surface is frictionless. The magnitude of the force that must be applied by a person to pull the rod at constant speed v is

A

0

B

Blv

C

Blv//R

D

`B^(2)l^(2)v//R`

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The correct Answer is:
A
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