Suppose a straight 1.00-mm-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 5.0 x 10^-5 T. What current would the wire carry? Does the answer seem feasible? Explain briefly.
The Attempt at a Solution
I'm completely lost. Please start in a couple of places so I can get moving on this. Thank you.