A straight, stiff, horizontal 25-cm-long wire that has a mass equal to 50 g is connected to a source of emf by light, flexible leads. A magnetic field of 2.66 T is horizontal and perpendicular to the wire. (a) Find the current necessary to "float" the wire, that is, when it is released from rest it remains at rest. (b) What is the direction of the magnetic force? Sketch the 3 vectors (magnetic field, length, and magnetic force).