Where m is the mass and V is the volume.
ρcopper = 8.96 × 103 kg/m3
The weight of the wire acts downward. Thus, the magnetic force should act upward.
Suppose a straight 1.40 mm -diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B⃗ , which is horizontal, perpendicular to the wire, and of magnitude 4.0×10−5 T. What current would the wire carry? Does the answer seem feasible
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