52. A crude classical (and wrong!) model for the production of the Earths magnetic field consists...

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52. ••• A crude classical (and wrong!) model for the production of the Earth’s magnetic field consists of a circular loop of current with a radius of 500 km with its center coincident with the Earth’s. Assuming the plane of the loop to be in the equatorial plane, and using a value of 0.10 mT for the Earth’s field at the poles,

(a) estimate the current in this theoretical loop.

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

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