Physics-
General
Easy

Question

The magnetic field at the centre of the coil in the figure shown below is (the wires crossing at P are insulated from each other)

  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 1 plus pi 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. fraction numerator mu subscript 0 end subscript over denominator 4 pi end fraction fraction numerator 2 I over denominator r end fraction open parentheses pi to the power of 2 end exponent plus 1 close parentheses    
  4. fraction numerator mu subscript 0 end subscript over denominator 4 pi end fraction fraction numerator 2 pi I over denominator r end fraction    

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 1 plus pi right parenthesis

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