p240_ct14_f07 - Physics 240 Fall 2007 Lecture#14 Dr Dave...

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Physics 240 Fall 2007 Lecture #14 Dr. Dave Winn 2405 Randall Lab [email protected]
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Electricity and magnetism Originally thought to be independent phenomena Both have action-at-a- distance force laws and by implication: fields Faraday and others believed in the unity of nature Maxwell found they were both aspects of a single phenomenon: electromagnetism. Michael Faraday James Clerk Maxwell
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Magnetism Natural permanent magnets known since ancient time (Magnesia) If isolated in a frictionless way, they align North-South Each has North and South ‘poles’ Two magnets exert forces on one another: aligned magnets repel, opposed magnets attract Action-at-a-distance suggested to Faraday a ‘magnetic field’, often denoted “B” Demos
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Mapping the magnetic field For the electric field, measure force on a test charge For the magnetic field, measure the torque on a test magnet North pole of test magnet points along direction of field Density of field lines indicates field strength North pole of the test magnet points to the south pole of the magnet creating the field Demos
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The Earth as a Magnet William Gilbert, around 1600, realized the action of a compass could be
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This note was uploaded on 04/04/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

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p240_ct14_f07 - Physics 240 Fall 2007 Lecture#14 Dr Dave...

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