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(a) Arigid circular loop of radius  ‘r’  & mass ‘m’ lies in the ‘xy’ plane on a flat table and has a current ‘I’ flowing in it.At this particular place, the earth’s magnetic field is Vector B =Vector Bx i + Vector By j. How large must ‘I’be before one edge of the loop will lift from table ?

(b) Repeat if, Vector B = Vector Bx i + Vector By K.

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Best answer

(a)Torque due to magnetic force should be greater than torque due to weight.

(b) Since, Bz is parallel to dipole moment

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