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Electromagnetic Induction — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsElectromagnetic Induction1 Mark
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 beImage
  • A
    Zero
  • ✓
    $2 \mathrm{Blv}$
  • C
    $B l v$
  • D
    $-B l v$
✓

Answer

Correct option: B.
$2 \mathrm{Blv}$
Two emfs induces in the closed circuit each of value $B l v$.
These two emf's are additive.
So $E_{\text {net }}=2 B l v$.

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