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A wire cd of length l and mass m is slid...

A wire `cd` of length `l` and mass `m` is sliding without friction on conducting rails `ax` and by as shown. The verticle rails are connected to each other with a resistance `R` between `a` and `b`. A uniform magnetic field `B` is applied perpendicular to the plane `abcd` such that `cd` moves with a constant velocity of

A

mg R/Bl

B

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

C

`mg R//Bl^(2)`

D

`mgR//B^(2)l`

Text Solution

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The correct Answer is:
B
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