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Suppose a straight 1.40 mmmm -diameter copper wire could just "float" horizontally in air because of...

Suppose a straight 1.40 mmmm -diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B which is horizontal, perpendicular to the wire, and of magnitude 4.8×10−5 T.

Part A) What current would the wire carry?

Part B) Does the answer seem feasible? (Yes or No)

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