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Two thick rods AB, CD are placed paralle...

Two thick rods `AB, CD` are placed parallel to each other at a distance `l`. their ends are joined to a resistance `R`. A magnetic field of induction `B` is applied perpendicular to the plane contaning the rods. If the rods are vertical, the terminal uniform velocity of the rod `PQ` of mass `m` is given by

A

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

B

`(mg.R)/(Bl)`

C

`(mg)/(BlR)`

D

`(mg l)/(BR)`

Text Solution

Verified by Experts

The correct Answer is:
A
`mg = Bil` and `i = (Blv_(T))/(R )`
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