A single circular (radius = R) loop of wire is located in the yz plane with its center at the origin. The loop has a clockwise current as seen from the point (+R, 0, 0). The direction of the magnetic field at the point
A) (0, 0, 0) is −i and at the point (+R, 0, 0) is −i.
B) (0, 0, 0) is −i and at the point (0, +2R, 0) is −i.
C) (0, 0, 0) is +i and at the point (+R, 0, 0) is +i.
D) (0, 0, 0) is +i and at the point (0, +2R, 0) is +i.
E) None of the above

Question

Quizplus · Accepted Answer

The magnetic field at the center of the loop is zero. The magnetic field at a point on the positive x-axis is in the -i direction.

A Single Circular (Radius = R) Loop of Wire Is