Lecture04 - 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 ) Lecture 4 Slide 1 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ PHYSICS 272 Lecture 4 Conductors and Insulators [EMI 15.4-15.7]
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 4 Slide 2 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ ReCap Last Time • Electric Field  (permanent) Dipole • Electric Field  induced Dipole • Example: electrical interaction/force b/t charge and neutral atom (induced dipole) Key concepts Polarization Insulators and conductors (how they interact w/t E-field and how charges move inside them) Charging & Discharging
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 4 Slide 3 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Polarization process It happens very quickly Step 1: Step 2: Step 3: + - + q 1 2 1 0 1 4 1 r q E  ) 2 ( ) 4 1 ( 2 4 1 2 4 1 5 1 2 0 3 1 0 3 0 2 r q r E r p E ) 2 ( ) 4 1 ( 5 2 1 2 0 2 1 r q E q F 5 1 r
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 4 Slide 4 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Clicker Question 1. The force of one of the permanent dipoles on the other is: A)Attractive B)Repulsive C)The force is zero
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 4 Slide 5 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Clicker Question 1. The force of one of the permanent dipoles on the other is: A)Attractive B)Repulsive C)The force is zero A: The LH dipole produced an E-field pointing to the right at the location of the RH dipole. The E-field is stronger at the – charge (and attractive) than at the + charge (and repulsive). Therefore the net force on the RH dipole points towards the LH dipole.
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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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Lecture04 - PHYS 272: Matter and Interactions II - Electric...

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