As a student technician, you are preparing a lecture demonstration on "magnetic suspension." you have a 15-cm long straight, rigid wire that will be suspended by flexible conductive lightweight leads above a long, straight wire. currents that are equal but are in opposite directions will be established in the two wires so the 15-cm wire "floats" a distance h above the long wire with no tension in its suspension leads. if the mass of the 15-cm wire is 13.4 g and if h (the distance between the central axes of the two wires) is 1.5 mm, what should their common current be?