A single circular (radius = R) loop of wire is located in the yz plane with its centre 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

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Quizplus · Accepted Answer

The magnetic field at the center of the loop is zero due to the symmetry of the current distribution. The magnetic field at a point on the positive x-axis is given by:$$B = \frac{\mu_0 I}{4\pi R}$$where:* $$\mu_0$$ is the permeability of free space* $$I$$ is the current in the loop* $$R$$ is the radius of the loopThe direction of the magnetic field is given by the right-hand rule. If you point your right thumb in the direction of the current, your fingers will curl in the direction of the magnetic field. In this case, the magnetic field points in the negative z-direction at the center of the loop and in the negative y-direction at a point on the positive x-axis.

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