Question

A magnetic compass needle is placed in the plane

Answer 1

Answer:

(In this case, the magnetic field due to current-carrying conductor is along the axis of the compass, i.e., in the vertical direction). The deflection is maximum when the conductor through A is perpendicular to the plane of the paper because in this case, its magentic field is maximum in the plane of the paper.

hope you get it....

Answer 2

the magnetic field due to current-carrying conductor is along the axis of the compass, i.e., in the vertical direction). The deflection is maximum when the conductor through A is perpendicular to the plane of the paper because in this case, its magentic field is maximum in the plane of the paper.