Answer:
The
straight current carrying conductor should be placed in the plane of paper so
that it passes through A. This produces magnetic field in a plane perpendicular
to plane of paper.
The compass needle remains undetected due to vertical magnetic field
produced by wire since compass needle are free to rotate only in horizontal
plane.
The deflection in compass needle is maximum when the conductor
through A is perpendicular to the plane of paper and the magnetic field due to
straight current conductor lies in the plane of paper.
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