Lecture03 - Fall 2010 Prof. Yong Chen ( [email protected]..

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Unformatted text preview: Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 3 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 Charged Objects; Polarization of Atoms; Induced Dipoles [EMI 15.1-15.3] Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 3 Slide 2 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ ReCap Last Time • Superposition principle (multiple charges) • Electric dipole & dipole moment – Electric field due to dipole – Dipole in Electric field Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 3 Slide 3 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Dipole Moment , , 2 4 1 3 1 r qs E , , 4 1 3 2 r qs E x: y, z: Dipole moment: p = qs qs p , , 2 4 1 3 1 r p E , , 4 1 3 2 r p E , direction from –q to +q r>>s Dipole moment is a vector pointing from negative to positive charge The electric field of a dipole is proportional to the Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 3 Slide 4 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Dipole in a Uniform Field E q F Forces on +q and –q have the same magnitude but opposite direction E q E q F net It would experience a torque about its center of mass. What is the equilibrium position? Electric dipole can be used to measure the direction of electric field. Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 3 Slide 5 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Choice of System Multiparticle systems: Split into objects to include into system and objects to be considered as external. To use field concept instead of Coulomb’s law we split the Universe into two parts: • the charges that are the sources of the field • the charge that is affected by that field Example: Oscilloscope Charges on metal plates are the sources of an uniform E field http://www.youtube.com/watch?v=rC8HBcsNm2g (first 3 minutes) Fall 2010 Prof. Yong Chen ( [email protected] ) Prof. Michael Manfra ( [email protected] ) Lecture 3 Slide 6 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Some Food for Thought • Dipoles and Piezoelectric Materials r r q E ˆ 4...
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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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Lecture03 - Fall 2010 Prof. Yong Chen ( [email protected]..

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