Lecture09-fall2011 - Fall 2010 Prof. Yong Chen (...

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Unformatted text preview: Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 7 Slide 1 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ PHYSICS 272 Electric & Magnetic Interactions Lecture 9 Electric Potentials [EMI 17.1-17.3] Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 7 Slide 2 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Introduced the concept of electric field E to deal with forces Introduce electric potential to consider work and energy Electric potential: electric potential energy per unit charge Practical importance: Reason about energy without having to worry about the details of some particular distribution of charges Batteries: provide fixed potential difference Electric Potential is easily measurable in electronics (voltage) Predict possible pattern of E field Potential is a scalar (number), simpler than vector (eg. E-field) Potential Energy To understand the dynamics of moving objects consider: forces, momenta, work, energy Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 7 Slide 3 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 7 Slide 4 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Physics 172 Physics 272 Gravitational potential Gravitational potential energy Electric potential Electric potential energy Electric potential is defined as electric potential energy per unit charge. Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 7 Slide 5 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Because electric forces are conservative. (We neglect the small gravitational force.) (closed system; no external force) Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 7 Slide 6 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ < U K ) ( < - = + + - =- =- = x eE z F y F x F W U U U x z y x A B - = U K Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 7 Slide 7 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ x V E x - = y V E y - = z V E z - = Generall y Fall 2010...
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This note was uploaded on 12/07/2011 for the course PHYS 272 taught by Professor K during the Fall '07 term at Purdue University-West Lafayette.

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Lecture09-fall2011 - Fall 2010 Prof. Yong Chen (...

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