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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)=vhati` . 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 :A. the rectangular, circular and elliptical loopsB. the circular and the elliptical loopsC. only the elliptical loopD. any of the four loops |
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Answer» Correct Answer - B Induced emf, `|e|=(dphi)/(dt)=(BdS)/(dt)` Now, as the square loop and rectangular loop move out of magnetic field, `(BdS)/(dt)` is constant, therefore `|e|` is constant. But in case of circular and elliptical loops, `(dS)/(dt)` changes. Therefore, `|e|` does not remain constant. |
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