College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Concept explainers

Magnetic Force
A magnetic force arises when a charged particle or a current-carrying conductor is placed in a magnetic field. It is created because of the movement of the charged particles.
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Suppose a conducting rod (mass m, resistance R) rests on two frictionless and resistanceless parallel rails a distance l apart in a uniform magnetic field B (⊥ to the rails and to the rod) as in the figure. At t = 0 the rod is at rest and a source of emf is connected to the points a and b. Find a formula for the net electric field in the moving rod as a function of time for the case, when the source puts out a constant current I. Find a formula for the net electric field in the moving rod as a function of time for the case when the source puts out a constant emf E0.

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