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One conducting U tube can slide inside a...

One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube maoves towards the other at a constant speed v. Then the emf induced in the circuit in terms of B, l and v where l is the width of each tube will be

A

`-Blv`

B

`Blv`

C

`2 Blv`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
C
(c) Relative velocity `=v+v=2v`
`:. Emf, =B.l(2v)`
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