Physics-
General
Easy

Question

A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is

  1. 10 blank pi mu blanktesla    
  2. 5 blank pi mu blanktesla    
  3. 4 blank pi mu blanktesla    
  4. 2 blank pi mu tesla    

The correct answer is: 5 blank pi mu blanktesla


    B equals fraction numerator 40 over denominator 4 pi end fraction cross times fraction numerator pi i over denominator r end fraction equals 10 to the power of negative 7 end exponent cross times fraction numerator pi cross times 10 over denominator 20 cross times 10 to the power of negative 2 end exponent end fraction blank 5 pi mu t e s l a

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