Physics-
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Question

A long straight wire, carrying current I, is bent at its midpoint to from an angle of 45°. Induction of magnetic field at point P, distant R from point of bending is equal to :

  1. fraction numerator left parenthesis square root of 2 minus 1 right parenthesis mu subscript 0 end subscript I over denominator 4 pi R end fraction    
  2. table row cell fraction numerator left parenthesis square root of 2 plus 1 right parenthesis mu subscript 0 end subscript I over denominator 1 end fraction end cell row cell 4 pi R end cell end table    
  3. fraction numerator left parenthesis square root of 2 minus 1 right parenthesis mu subscript 0 end subscript I over denominator 4 square root of 2 pi R end fraction    
  4. fraction numerator left parenthesis square root of 2 plus 1 right parenthesis mu subscript 0 end subscript I over denominator 4 square root of 2 pi R end fraction    

The correct answer is: fraction numerator left parenthesis square root of 2 minus 1 right parenthesis mu subscript 0 end subscript I over denominator 4 pi R end fraction

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