Physics-
General
Easy

Question

A loop carrying current I lies in the x-y plane as shown in fig The unit vector stack k with hat on top is coming out of the plane of the paper The magnetic moment of the current loop is

  1. a to the power of 2 end exponent I stack k with hat on top    
  2. open parentheses fraction numerator pi over denominator 2 end fraction plus 1 close parentheses a to the power of 2 end exponent I stack k with hat on top    
  3. negative open parentheses fraction numerator pi over denominator 2 end fraction plus 1 close parentheses a to the power of 2 end exponent I stack k with hat on top    
  4. left parenthesis 2 pi plus left parenthesis A right parenthesis a to the power of 2 end exponent I stack k with hat on top    

The correct answer is: open parentheses fraction numerator pi over denominator 2 end fraction plus 1 close parentheses a to the power of 2 end exponent I stack k with hat on top

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