Physics-
General
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Question

A square coil of side 25 cm having 1000 turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant t, the emf induced in the coil is e =200sin 100pi t. The magnetic induction is

  1. 0.50 T  
  2. 0.02 T  
  3. 10 to the power of negative 3 end exponent blank T  
  4. 0.01 T  

The correct answer is: 0.01 T


    e equals 200 sin invisible function application 100 blank pi t
    We have,
    e subscript 0 end subscript equals 200 comma
    omega equals 100 blank pi
    therefore B A N omega equals e subscript 0 end subscript
    therefore blank B equals fraction numerator e subscript 0 end subscript over denominator A N omega end fraction
    equals fraction numerator 200 over denominator left parenthesis 0.25 cross times 0.25 right parenthesis cross times 1000 cross times 100 pi end fraction
    OrB equals 0.01 blank T

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