Q. 18

Figure shows a square loop of edge a made of a uniform wire. A current i enters the loop at the point A and leaves it at the point C. Find the magnetic field at the point P which is not the perpendicular bisector of AB at a distance a/4 from it.



Answer :

18.PNG




magnetic field due to AB






magnetic field due to DC






The magnetic field due to AD and BC are equal and opposite hence nullify each other


Hence, net magnetic field




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