Physics-
General
Easy

Question

Two magnets of equal mass are joined at 90degree each other as shown in figure. Magnet N subscript 1 end subscript S subscript 1 end subscript has a magnetic moment square root of 3 times that of N subscript 2 end subscript S subscript 2 end subscript. The arrangement is pivoted so that it is free to rotate in horizontal plane. When in equilibrium, what angle should N subscript 1 end subscript S subscript 1 end subscript make with magnetic meridian?

  1. 75degree    
  2. 60degree    
  3. 30degree    
  4. 45degree    

The correct answer is: 30degree


    In equilibrium, the resultant magnetic moment will be along magnetic meridian. Let N subscript 1 end subscript S subscript 1 end subscript make angle theta with resultant
    t a n theta equals fraction numerator M subscript 2 end subscript over denominator M subscript 1 end subscript end fraction equals fraction numerator M over denominator square root of 3 M end fraction equals fraction numerator 1 over denominator square root of 3 end fraction blank therefore theta equals 30 degree

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