Rod on Rails Two The conducting rod shown in Fig. 31-42 has alength L and is being pulled along horizontal, frictionless,conducting rails at a constant velocity v. The rails are connectedat one end with a metal strip. A uniform magnetic field , directedout of the page, fills the region in which the rod moves. Assumethat L = 17 cm, v = 6.4 m/s, and B = 1.0 T.
Figure 31-42
(a) What is the magnitude of the emf induced in the rod?
V
(b) What is the magnitude and direction of the current in theconducting loop? Assume that the resistance of the rod is 0.40 andthat the resistance of the rails and metal strip is negligiblysmall.
A
(c) At what rate is thermal energy added to the rod?
W
(d) What magnitude of force must be applied to the rod by anexternal agent to maintain its motion?
N
(e) At what rate does this external agent do work on the rod?
W Compare the answer for (e) with the answer to (c).
Section 31.6 Induction and Energy Transfers
DIAGRAM
http://img809.imageshack.us/i/3154.gif/
Rod on Rails Two The conducting rod shown in Fig. 31-42 has alength L and is being pulled along horizontal, frictionless,conducting rails at a constant velocity v. The rails are connectedat one end with a metal strip. A uniform magnetic field , directedout of the page, fills the region in which the rod moves. Assumethat L = 17 cm, v = 6.4 m/s, and B = 1.0 T.
Figure 31-42
(a) What is the magnitude of the emf induced in the rod?
V
(b) What is the magnitude and direction of the current in theconducting loop? Assume that the resistance of the rod is 0.40 andthat the resistance of the rails and metal strip is negligiblysmall.
A
(c) At what rate is thermal energy added to the rod?
W
(d) What magnitude of force must be applied to the rod by anexternal agent to maintain its motion?
N
(e) At what rate does this external agent do work on the rod?
W Compare the answer for (e) with the answer to (c).
Section 31.6 Induction and Energy Transfers
DIAGRAM
http://img809.imageshack.us/i/3154.gif/
