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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

Zero

B

`2Blv`

C

Blv

D

`-Blv`

Text Solution

Verified by Experts

The correct Answer is:
B
Relative velocity `= v +v = 2v`
`:.` emf (e) = Blv. = 2Blv.
Aliter : Two emf.s are induced in the closed circuit, each of value Blu. These two emfs are additive. So, `E_("net") = 2Blv`
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