# 110504 - Physics 122 5/4/11 May 4, 2011 Theme Physics 122...

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Physics 122 5/4/11 Prof. E. F. Redish 1 5/4/11 1 Physics 122 ± Theme Music: Earth, Wind, & Fire Magnetic ± Cartoon: Baldo May 4, 2011 Physics 122 Prof. E. F. Redish 5/4/11 2 Physics 122 Outline ± Go over Q10 ± Recap: Capacitors – Dielectrics ± Magnetism basics ± Magnetism and moving charge ± The magnetic field ± The magnetic force Quiz 10 10.1 10.2.1 10.2.2 10.3 a 4% s 4% 78% a 5% b 90% d 93% 10% b 0% c 1% b 1% 10% c 40% d 1% p 1% 1% d 22% e 1% e 26% f 1% f 39% ab 3% g 16% 5/4/11 4 Physics 122

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5/4/11 Prof. E. F. Redish 2 Capacitors: Foothold ideas 5/4/11 6 Physics 122 ± Although local neutrality is almost always true, various configurations support local charge separations. ± Such separations are always associated with electric fields and hence with potential differences. ± The ratio of the charge separation to the potential difference is the capacitance . ± Charge separations take work to create and are associated with stored energy. E Δ x = −Δ V Q = C Δ V Δ U = 1 2 Q Δ V 5/4/11 13 Physics 122 Magnetism: A New Non-Touching Force ± What is your experience with magnets? ± Generate tentative foothold principles. Foothold ideas: Phenomenology of Magnets 5/4/11 14 Physics 122 ± Certain objects (magnets) attract and repel other magnets depending on orientation. ± Magnets (all orientations) attract a certain class of other objects – iron, steel,… but not all metals (e.g., aluminum, copper,…). ± Objects that are attracted by magnets can be made into magnets by being stroked consistently in one direction with a magnet. ± Magnets can lose their magnetism by heating or hammering.
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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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110504 - Physics 122 5/4/11 May 4, 2011 Theme Physics 122...

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