A conducting rod slides down between two frictionless vertical copper tracks at a constant speed of 4.4 m/s perpendicular to a 0.54-t magnetic field. the resistance of the rod and tracks is negligible. the rod maintains electrical contact with the tracks at all times and has a length of 1.1 m. a 0.77-î resistor is attached between the tops of the tracks. (a) what is the mass of the rod? a) 0.30 kg b) 0.45 kg c) 0.60 kg d) 0.75 kg
