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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

`2B l V`

B

zero

C

`-B l V`

D

`B l V`

Text Solution

Verified by Experts

The correct Answer is:
A
Two emf's, each of value `Blv`, are produced. Both the emf's tend to send currents in the same direction so they are added up.
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