The conducting rod shown in Fig. 31-54 has a length L and is being pulled along

Question

The conducting rod shown in Fig. 31-54 has a length L and is being pulled along horizontal, frictionless, conducting rails at a constant velocity v. The rails are connected at one end with a metal strip. A uniform magnetic field B, directed out of the page, fills the region in which the rod moves. Assume that L = 22 cm, v = 8.2 m/s, and B = 1.1 T.

upto the right     downto the left

(e) At what rate does this external agent do work on the rod?
____ W
(f) What percentage of this work goes into generating the thermal energy found in (c)?
_____ %

Explanation / Answer

a) The induced efm is:

e = VLB = 1.9844 V

b)the current is:

I = e/R = 4.961 A

c) The powe is:

P = eI=9.8446 W

d) the force is:

F = ILB = 1.20 N

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