# Magnestism

A wire carrying a current $$I$$ is shaped as shown. Section $$AB$$ is a quarter circle of radius $$r$$. The magnetic field at $$C$$ is directed

(A) Along the bisector of the angle $$ACB$$, away from $$AB$$.
(B) Along the bisector of the angle $$ACB$$, towards $$AB$$.
(C) Perpendicular to the plane of the paper, directed into the paper.
(D) At an angle $$\frac \pi4$$ to the plane of the paper.

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