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A rod with resistance R lies across fric...

A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field `vecB`, as shown in the following figure. Assume the rails have negligible resistance. The magnitude of the force that must be applied by a person to pull the rod to the right 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:
D
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