A circular loop is kept in that vertical plane which contains the north-south direction. It carries a current that is towards north at the topmost point. Let A be a point on the axis of the circle to the east of it and B a point on this axis to the west of it. The magnetic field due to the loop.
(a) is towards east at A and towards west at B
(b) is towards west at A and towards east at B
(c) is towards east at both A and B
(d) is towards west at both A and B.
