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A straight 2.00-m, 150-g wire carries a current in a region where the earth s magnetic field is horizontal with a magnitude of 0.55 gauss.
(a) What is the minimum value of the current in this wire so that its weight is completely supported by the magnetic force due to earth s field, assuming that no other forces except gravity act on it? Does it seem likely that such a wire could support this size of current?
(b) Show how the wire would have to be oriented relative to the earth s magnetic field to be supported in this way. |
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