# Question

A crude model of the Earthâ€™s magnetic field consists of a circular loop of current with a radius of 500 km with its center coincident with that of the Earthâ€™s. Assuming the plane of the loop to be approximately in the equatorial plane, and using a value of 0.10 mT for the magnitude of the Earthâ€™s field at the poles,

(a) Estimate the current in the theoretical loop.

(b) What would be the magnetic moment (magnitude and direction) of this supposed loop?

(a) Estimate the current in the theoretical loop.

(b) What would be the magnetic moment (magnitude and direction) of this supposed loop?

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