In Fig. 21-11, the rod moves with a speed of 1.6 m/s on rails 30.0 cm apart. The rod has a resistance of 2.5Ω. The magnetic field is 0.35 T, and the resistance of the conductor 21.0 Ω is at a given instant. Calculate
(a) The induced emf,
(b) The current in the U-shaped conductor, and
(c) The external force needed to keep the rod's velocity constant at that instant.

Transcribed Image Text:

Force on electron AA B (outward)