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6. Electromagnetic induction — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics6. Electromagnetic induction1 Mark
MCQ
A rectangular, a square, a circular and an elliptical loop, all in the $(x-y)$ plane, are moving out of a uniform magnetic field with a constant  velocity, $\vec V = v\hat i$. The magnetic field is directed along the negative $z$ axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for 
  • ✓
    the circular and the elliptical loops
  • B
     only the elliptical loop
  • C
     any of the four loops
  • D
    the rectangular, circular and elliptical loops
✓

Answer

Correct option: A.
the circular and the elliptical loops
a
Once a rectangular loop or a square loop is being drawn out of the field, the rate of cutting the lines of field will be a constant for a square and rectangle, but not for circular or elliptical areas. 

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