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The magnitude of the Earth’s magnetic field at either pole is approximately 7.00 x 10-5 T. Suppose that the field fades away, before its next reversal. Scouts, sailors, and conservative politicians around the world join together in a program to replace the field. One plan is to use a current loop around the equator, without relying on magnetization of any materials inside the Earth. Determine the current that would generate such a field if this plan were carried out. (Take the radius of the Earth as RE = 6.37 x 106 m.) |
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