Physics-
General
Easy

Question

In the figure, what is the magnetic field at the point O

  1. fraction numerator mu subscript 0 end subscript I over denominator 4 pi r end fraction    
  2. fraction numerator mu subscript 0 end subscript I over denominator 4 pi r end fraction plus fraction numerator mu subscript 0 end subscript I over denominator 2 pi r end fraction    
  3. fraction numerator mu subscript 0 end subscript I over denominator 4 r end fraction plus fraction numerator mu subscript 0 end subscript I over denominator 4 pi r end fraction    
  4. fraction numerator mu subscript 0 end subscript I over denominator 4 r end fraction minus fraction numerator mu subscript 0 end subscript I over denominator 4 pi r end fraction    

The correct answer is: fraction numerator mu subscript 0 end subscript I over denominator 4 r end fraction plus fraction numerator mu subscript 0 end subscript I over denominator 4 pi r end fraction

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