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6. Electromagnetic induction — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics6. Electromagnetic induction1 Mark
MCQ
A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at $t = 0$ and completely emerges out at $t = T\,sec$. The current in the ring varies as
  • A

  • ✓

  • C

  • D

✓

Answer

Correct option: B.

b
When ring enters the field an $emf$ is induced due to change in flux. Once with the magnetic field, there is no change in flux in the ring so there is no $emf$. When it emerges out of the field, once again there is a flux change which creates $emf$ in reverse direction. Graph $(b)$ shows this result.

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