A circular loop is kept in that vertical plane which contains the north-south direction. It carries a current that is toward 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

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is toward east at A and toward west at B

is toward west at A and toward east at B

is toward east at both A and B

is toward west at both A and B

answer is D.

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Detailed Solution

Using right hand rule, the direction of magnetic field is clearly toward west at A and B

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