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A conducting wire ab of length l, resist...

A conducting wire ab of length l, resistance r and mass m starts sliding down a smooth vertical, thick pair of perfectly conducting rails as shown in the figure. A uniform magnetic field B exist in the space in the figure. A uniform magnetic field B exist in the space in a direction perpendicular to the plane of the rails. What will be the final constant speed of wire?

A

mg R/Bl

B

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

C

`mg R//Bl^(2)`

D

`mgR//B^(2)l`

Text Solution

Verified by Experts

The correct Answer is:
B
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