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Statement of a problem № 3842

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It is believed that the earth's magnetic field is produced by circulating current in the core. If the mean radius of such currents is 1000 km, what is the order of magnitude of current required to account for the earth's dipolar magnetic field of magnitude 6x10^5 T at the north magnetic pole?

Solution:
It is believed that the earth's magnetic field is produced by circulating curren

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