Answer :

Length of the wire is 12a.


Area of equilateral triangle is


Number of loops made is n=12a/3a = 4


So, magnetic moment is m=niA




Area of equilateral square is


Number of loops made is n=12a/4a = 3


So, magnetic moment is m=niA



Area of hexagon is


Number of loops made is n=12a/6a = 2


So, magnetic moment is m=niA




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