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A wire carrying current i is shaped as shown. Section AB is a quarter circle of radius r. 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 in to the paper

(c) Along the bisector of the angle ACB towards AB

(d) Along the bisector of the angle ACB away from AB