Q.
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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a
is toward east at A and toward west at B
b
is toward west at A and toward east at B
c
is toward east at both A and B
d
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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