110509 - Physics 122 5/10/10 May 9, 2011 Physics 122 Prof....

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Physics 122 5/10/10 Prof. E. F. Redish 1 5/10/10 1 Physics 122 ± Theme Music: Matisyahu I Will be Light* ± Cartoon: Pat Brady Rose is Rose May 9, 2011 Physics 122 Prof. E. F. Redish *Thanks to Dan Makover For bringing this song to my attention Outline ± Quiz 11: Capacitors (using clickers) ± What is light? – Unified theory of electromagnetism – Maxwell’s rainbow – Hertz’s invisible light – But… 5/10/10 2 Physics 122 Model of magnetism (alpha): Magnetic poles ± Magnetism is a third “non-touching” force like gravity and electricity. ± Magnets are made up of ± magnetic charges ² analogous to electric charges but different. We will call them ± magnetic poles ² – North and South to distinguish them from Positive and Negative. ± Magnetic materials are made up of N and S just like they have + and - charges. When they are magnetized, the N ³ s and S ³ s separate. 5/10/10 3 Physics 122
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Physics 122 5/10/10 Prof. E. F. Redish 2 5/10/10 4 Physics 122 Is there ± magnetic charge ² ? ± If you break a magnet in half, both parts are still full (N-S) magnets. ± You can do this all the way down to a single electron and it still holds true (and you can ³ t break a single electron). ± Our ± little dipoles ² turn out to be electrons. Model of magnetism (beta): Magnetic dipoles ± No separate magnetic poles have ever been found. ± All matter contains small ± magnetic dipoles ² little bar magnets that cannot be broken. ± When magnetic materials are magnetized, the little dipoles are aligned and the forces they exert on each other hold each other in place. ± When they are heated, the little magnets lose their alignment and go random. 5/10/10 5 Physics 122 5/10/10 6 Physics 122 Basic Particles ± The fundamental particles making up matter (electrons and protons and neutrons) can be classified by how they behave in response to (and as sources of) gravity, electricity, and magnetism. Mass Charge Magnetic Moment proton 1.67 x 10 -27 kg 1.6 x 10 -19 C 0.0015 Bohr magnetons neutron 1.67 x 10 -27 kg 0 0.0010 Bohr magnetons electron 9.1 x 10 -31 kg -1.6 x 10 -19 C 9.28 Bohr magnetons
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Physics 122 5/10/10 Prof. E. F. Redish 3 Moving electrons are deflected by a magnet.
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This note was uploaded on 12/28/2011 for the course PHYSICS 122 taught by Professor Bhagat during the Fall '11 term at Maryland.

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110509 - Physics 122 5/10/10 May 9, 2011 Physics 122 Prof....

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