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A conducting rod of resistence r moves u...

A conducting rod of resistence r moves uniformely with a constant speed v. If the rod keeps moving uniformly, then the amount of force required is -

A

`(vB^(2)l^(2))/(R )`

B

`(2vB^(2)l^(2))/((R+r ))`

C

`(vB^(2)l^(2))/((R +r))`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
C
`F=I l B`
`=(vB l)/((R +r))lB`
`=(vB^(2)l^(2))/((R+r))`
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