In the figure below, the rod moves to the right with a speed of 1.6 m/s, and has a resistance of 2.2 Ω. The rail separation is l = 25 cm. The magnetic field is 0.32 T, and the resistance of the U-shaped conductor is 26.0 Ω at a given instant.
(a) Calculate the induced emf.
(b) Calculate the current flowing in the U-shaped conductor.
(c) Calculate the external force needed to keep the rod's velocity constant at that instant.