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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

2 Blv

C

Blv

D

`-Blv`

Text Solution

Verified by Experts

The correct Answer is:
B
Two emfs are induced in the closed circuit each of value Blv. Their two emfs are additive. So, `E_("net")=2Blv`.
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