Consider a straight piece of copper wire of length 8 m and diameter 4 mm that carries a current I = 3.5 A. There is a ma

[answerhappygod]

Consider a straight piece of copper wire of length 8 m anddiameter 4 mm that carries a current I = 3.5 A. There is a magneticfield of magnitude B directed perpendicular to the wire, and themagnetic force on the wire is just strong enough to “levitate” thewire (i.e., the magnetic force on the wire is equal to its weight).Find B. Hint: The density of copper is 9000 kg/m3 .