Lecture03-fall2011

Lecture03-fall2011 - PHYS 272 Matter and Interactions II...

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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 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 3 Superposition of electric field; Dipoles Note: for iclickers to work: 1) must be turned on prior to answering question, 2) set proper frequency “AB” – hold down power button for ~2 sec, then press “A” and “B”
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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 Slide 2 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ The net electric field at a location in space is a vector sum of the individual electric fields contributed by all charged particles located elsewhere. The Superposition Principle The electric field contributed by a charged particle is unaffected by the presence of other charged particles.
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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 Slide 3 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ The Superposition Principle
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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 Slide 4 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ The E of a Uniformly Charged Sphere Can calculate using principle of superposition: r r Q E sphere ˆ 4 1 2 0 πε = for r>R (outside) 0 = sphere E for r<R (inside)
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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 Slide 5 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Electric dipole: Two equally but oppositely charged point-like objects What is the E field far from the dipole (r>s)? +q -q s Example of electric dipole: HCl molecule The Superposition Principle The electric field of a dipole:
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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 Slide 6 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ +q s x y z Choice of origin: use symmetry Calculating Electric Field Choice of the origin
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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 Slide 7 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ 1. E along the x -axis x x x E E E , , , 1 - + + = = 1 4 πε 0 q r - s 2 ( 29 2 + 1 4 0 - q r + s 2 ( 29 2 E 1, x = 1 4 0 qr 2 + qrs + qs 2 / 4 - qr 2 + qrs - qs 2 / 4 r - s 2 ( 29 2 r + s 2 ( 29 2 E 1, x = 1 4 0 2 qrs r - s 2 ( 29 2 r + s 2 ( 29 2
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Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 2 Slide 8
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Lecture03-fall2011 - PHYS 272 Matter and Interactions II...

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