A thin copper rod has a mass per unit length of 0.1 kg/m. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.5 T? (g = 10.0 m/s²) 1. 02.9 A 2. 02.5 A 3. 02.2 A 4. 02.0 A 5. 01.8 A
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