Review Conceptual Example 3 and Figure 22.7b. A conducting rod slides down between two frictionless vertical copper tracks at a constant speed of 4.0 m/s perpendicular to a 0.50-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 1.3 m. A 0.75-Ω resistor is attached between the tops of the tracks.
(a) What is the mass of the rod?
(b) Find the change in the gravitational potential energy that occurs in a time of 0.20 s.
(c) Find the electrical energy dissipated in the resistor in 0.20 s.
Figure 22.7b

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