College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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a toy train uses a magnetic field to propel it down a track. A series of flat, permanent magnets align the length of both rails of the track. In place of wheels, the train rides an axle that lays across the track. A current flows through the axle at all times. In which direction must the poles of the permanent magnets face in order to propel the train down the rails?
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