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 :

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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