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Two parallel long straight conductors li...

Two parallel long straight conductors lie on a smooth surface. Two other parallel conductors rest on them at right angless so as to form a square of side a initially. A uniform magnetic field B exists at right angles to the plane containing the conductors. They all start moving out with a constant velocity v. If r is the resistance per unit length of the wire the current in the circuit will be

A

`(Bv)/r`

B

`(Br)/v`

C

`Bvr`

D

`Bv`

Text Solution

Verified by Experts

The correct Answer is:
A
`(dphi)/(dt)=B(dA)/(dt)`
`=B.4x(dx)/(dt)`
`e=4Bxv`
`I=e/R=(4Bxv)/(4xr)=(Bv)/r`
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