Question

8. Two long straight copper wires of diameter d = 0.2 mm are parallel to each other, one above the other, at a distance of 1 mm (measured center to center). The mass density of copper is 8.96 g/cm3. a) Compute the weight of a wire, per meter. b) If you run a current / through both wires you could, in principle, suspend the lower wire, i.e. make the magnitude of the magnetic force on it equal to its weight. In what direction would the two currents have to be (parallel or antiparallel)? Compute the magnitude of the current that would be required to suspend the lower wire. c)

Answer 1