In the figure, the rod moves to the right with a speed of 1.5 m/s and has a resistance of 2.9 Ω .(Figure 1) The rail separation is l = 23.5 cm. The magnetic field is 0.30 T , and the resistance of the U-shaped conductor is 25.0 Ω at a given instant.
Calculate the induced emf.
Express your answer to two significant figures and include the appropriate units.
Calculate the current in the U
-shaped conductor.
Express your answer to two significant figures and include the appropriate units.
Calculate the external force needed to keep the rod's velocity constant at that instant.
Express your answer to two significant figures and include the appropriate units.