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Question

A coil having an area 2 m to the power of 2 end exponent is placed in a magnetic field which changes from 1 W b divided by m to the power of 2 end exponent to 4 W b divided by m to the power of 2 end exponent in an interval of 2 blank s e c o n d. The e.m.f. induced in the coil will be

  1. 4 blank V  
  2. 3 blank V  
  3. 1.5 blank V  
  4. 2 blank V  

The correct answer is: 3 blank V


    open vertical bar e close vertical bar equals A. fraction numerator increment B over denominator increment t end fraction equals 2 cross times fraction numerator left parenthesis 4 minus 1 right parenthesis over denominator 2 end fraction equals 3 V

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