lecture15 - PHYS 272: Matter and Interactions II - Electric...

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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec15 Slide 1/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ PHYSICS 272 Lecture 15 Electric Fields and Circuits [EMI Ch.19] Prof. Manfra is giving both sections’ lecture today
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec15 Slide 2/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ (macroscopic) observables do not change with time Take copper as an example: Drift speed = 5 × 10 -5 m/s; Mobility = 4.5 × 10 -3 (m/s)/(N/C) E-field ~ 10 -2 N/C (small ) but adequate to push a sizable current through the copper wire
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec15 Slide 3/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ E nAu i n is assumed the same everywhere (same material) 1. There must be an electric field in the wires. 2. The magnitude of the E-field must be the same through- out a wire of uniform cross section and material. 3. The direction of the E-field at every location must be along the wire, since current flow follows the wire.
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec15 Slide 4/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Ex1.
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec15 Slide 5/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Ex.2
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec15 Slide 6/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ 2 mm 1 mm 1.5 .
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This note was uploaded on 02/02/2012 for the course STAT stat512 taught by Professor Libo during the Spring '11 term at Purdue North Central.

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lecture15 - PHYS 272: Matter and Interactions II - Electric...

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