29. Sources of Magnetic Field
Magnetic Field Produced by Straight Currents
Multiple Choice
Multiple ChoiceA wire near the equator carries a current perpendicular to the Earth's magnetic field of in a location where the field is parallel to the ground and points straight north. The wire has a mass per length of . What magnitude of current in the wire could balance it against the force of gravity? (This example is not very realistic. The mass per length given would be reasonable for a very thin wire which could not handle this large of a current for very long.)
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