First slide
Force on a current carrying wire placed in a magnetic field

A square loop ABCD carrying a current i,is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be



 Force on arm AB due to current in conductor XY is 


acting towards X Y in the plane of loop. Force on arm CD due to current in conductor X Y is


acting away from X Y in the plane of loop.
therefore Net force on the loop =F1-F2


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