Suppose that the magnetic field of the earth were due to a, Ask an Expert

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Suppose that the magnetic field of the Earth were due to a single current moving in a circle of radius 2910 km through the Earth's molten core. The strength of the Earth's magnetic field on the surface near a magnetic pole is about 6.0 x 10^-5 T. How large a current (in the equatorial plane) would be required to produce such a field?

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