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Questions  

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

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

detailed solution

Correct option is B

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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