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Physics-

General

Easy

Question

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 speed $v$ , then the emf induced in the circuit in terms of $B comma blank l a n d blank v comma blank w h e r e blank l$ is the width of each tube, will be

$B l v$
$- B l v$
Zero
$2 B l v$

The correct answer is: $2 B l v$

Relative velocity $equals v minus open parentheses negative v close parentheses equals 2 v equals fraction numerator d l over denominator d t end fraction$
Now, $e equals fraction numerator d ϕ over denominator d t end fraction$
$e equals fraction numerator B l d l over denominator d t end fraction open parentheses fraction numerator d l over denominator d t end fraction equals 2 v close parentheses$
Induced emf $e equals 2 blank B l v$

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parallel

Which of the following is correct?

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parallel

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