Physics-
General
Easy

Question

A coil having N turns carry a current I as shown in the figure. The magnetic field intensity at point P is

  1. fraction numerator mu subscript 0 end subscript N I R to the power of 2 end exponent over denominator 2 left parenthesis R to the power of 2 end exponent plus x to the power of 2 end exponent right parenthesis to the power of 3 divided by 2 end exponent end fraction    
  2. fraction numerator mu subscript 0 end subscript N I over denominator 2 R end fraction    
  3. fraction numerator mu subscript 0 end subscript N I R to the power of 2 end exponent over denominator left parenthesis R plus x right parenthesis to the power of 2 end exponent end fraction    
  4. Zero    

The correct answer is: fraction numerator mu subscript 0 end subscript N I R to the power of 2 end exponent over denominator 2 left parenthesis R to the power of 2 end exponent plus x to the power of 2 end exponent right parenthesis to the power of 3 divided by 2 end exponent end fraction

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