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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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