The earth magnetic field is generated by?
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The earth's magnetic dipole moment is 8.0 × 1022 A m2.
Part A. What is the magnetic field strength on the surface of the earth at the earth's north magnetic pole? You can assume that the current loop is deep inside the earth. Also, the radius of the earth is 6.37 × 106 m.
Part B. Astronauts discover an earth-size planet without a magnetic field. To create a magnetic field the same strength as the earth's, so that compasses will work, they propose running a current through a wire around the equator. What size current would be needed? (Model this current loop as a magnetic dipole.)
