lecture23-fall2011

lecture23-fall2011 - PHYS 272: Matter and Interactions II -...

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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec21 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 23 Field Lines/Pattern in Space [Chap 22] Faraday’s Law [Chap 23] No recitations or labs this week Exam 2 average: Machine graded 45.8, Hand graded 22.2
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec21 Slide 2/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Gauss’s law applied to circuits 0 = Φ = el nAuE i No excess charges inside the wire
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec21 Slide 3/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Gauss’s law applied to circuits Current node rule: i 1 = i 2 i.e. n 1 Au 1 E 1 = n 2 Au 2 E 2 0 < Φ el Negative excess charges on the interface
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec21 Slide 4/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ 0 ˆ ε = inside surface q A n E Gauss’s Law: Screening Is the field zero inside the box because the metal blocks the field?
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec21 Slide 5/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec21 Slide 6/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/
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lecture23-fall2011 - PHYS 272: Matter and Interactions II -...

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