In Figure part of a long insulated wire carrying current r = 5.78 mA is bent into a circular section of radius R = 1.89 cm. In unit-vector notation, what is the magnetic field at the center of curvature C it the circular section

(a) Lies in the plane of the page as shown and

(b) Is perpendicular to the plane of the page after being rotated 90? counterclockwise as indicated?

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