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6. Electromagnetic induction — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics6. Electromagnetic induction1 Mark
MCQ
A rectangular loop is being pulled at a constant speed $v$, through a region of certain thickness $d$, in which a uniform magnetic field $B$ is set up. The graph between position $x$ of the right hand edge of the loop and the induced emf $E$ will be
  • A

  • ✓

  • C

  • D

✓

Answer

Correct option: B.

b
(b) As x increases so $\frac{{dB}}{{dt}}$increases i.e. induced $emf$ $(e)$ is negative. When loop completely entered in the magnetic field, emf =$0$
When it exit out $x$ increases but $\frac{{dB}}{{dt}}$ decreases i.e. $e$ is positive.

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