One conducting U tube can slide inside another as shown in figure… - Vidyadip

MCQ

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 moves towards the other at a constant sped $v$ 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
✓
$2\,Blv$
C
$Blv$
D
$ - Blv$

✓

Answer

Correct option: B.

$2\,Blv$

b
Two emf's induces in the closed circuit each of value $Bl\,v$. These two emf's are additive. So ${E_{{\rm{net}}}} = 2Bl\,v$.

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