Physics-
General
Easy

Question

An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be

  1. fraction numerator mu subscript 0 end subscript over denominator 4 pi end fraction fraction numerator 2 i over denominator r end fraction left parenthesis pi plus 1 right parenthesis    
  2. fraction numerator mu subscript 0 end subscript over denominator 4 pi end fraction fraction numerator 2 i over denominator r end fraction left parenthesis pi minus 1 right parenthesis    
  3. Zero    
  4. Infinite    

The correct answer is: fraction numerator mu subscript 0 end subscript over denominator 4 pi end fraction fraction numerator 2 i over denominator r end fraction left parenthesis pi minus 1 right parenthesis


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