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Q.

A wire carrying current i is shaped as shown. Section AB is a quarter circle of radius r and current is flowing from A to B. The magnetic field is directed

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a

At an angle π/4 to the plane of the paper

b

Perpendicular to the plane of the paper and directed into the paper

c

Along the bisector of the angle A CB towards AB

d

Along the bisector of the angle A CB away from AB

answer is B.

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Detailed Solution

Using Right hand palm rule or Maxwell's Cork screw rule, we get the field to be perpendicular to the plane of the paper and directed into it.
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