Physics-
General
Easy

Question

A rectangular, a square, a circular and an elliptical loop, all in the left parenthesis x minus y right parenthesis plane, are moving out of a uniform magnetic field with a constant velocity stack V with rightwards arrow on top equals v blank stack i with rightwards arrow on top. The magnetic field is directed along the negative z-axis direction. The induced e m f, during the passage of these loops, out of the field region, will not remain constant for

  1. The rectangular, circular and elliptical loops  
  2. The circular and the elliptical lops  
  3. Only the elliptical loop  
  4. Any of the four loops  

The correct answer is: The circular and the elliptical lops


    open vertical bar e close vertical bar equals fraction numerator d ϕ over denominator d t end fraction equals fraction numerator B d A over denominator d t end fraction
    Now, as the square loop and rectangular loop move out of magnetic field, fraction numerator d A over denominator d t end fraction is constant, therefore vertical line e vertical line is constant. But in case of circular and elliptical loops, fraction numerator d A over denominator d t end fraction changes. Therefore, vertical line e vertical line does not remain constant

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