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The figure shows a 21-cm-long metal rod pulled along two frictionless, conducting rails at a constant speed of 3.4 m/s. The rails have negligible resistance, but the rod has a resistance of 070 Ω (Figure 1) Figure 1

1.what is the current induced in the rod?
2.what is the magnitude of the force required to keep the rod moving at a constant speed?

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Manoj Pandey
Manoj PandeyLv10
25 Dec 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

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/

The figure below shows a rod of length L = 7.0 cm that is forced tomove at constant speed = 2.00 m/s along horizontal rails. The rod,rails, and connecting strip at the right form a conducting loop.The rod has resistance 0.300 ; the rest of the loop has negligibleresistance. A current i = 110 A through the long straight wire atdistance a = 10.0 mm from the loop sets up a (non-uniform) magneticfield through the loop.

(a) Find the emf induced in the loop.
V

(b) Find the current induced in the loop.
A

(c) At what rate is thermal energy generated in the rod?
W

(d) What is the magnitude of the force that must be applied to therod to make it move at constant speed?
N

(e) At what rate does this force do work on the rod?
W

A 0.2kg metal rod carrying a current of 10A glides on two horizontal rails 0.5m apart. What is the magnitude of the force is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is 0.1?

 

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