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

  • A
    At an angle $\pi /4$ 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 $ACB$ towards $AB$
  • D
    Along the bisector of the angle $ACB$ away from $AB$

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