Lecture09 - 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 8 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 17.6-17.8] Reminder about Exam1! TONIGHT 09/22 Evening 8-9:30pm in PHYS 112 & 114 (covers Chap 14-16; closed book; equation sheet will be provided) Bring a calculator ; See Course web for details (practice exam+keys] [DOS-approved Special Accommodation Students Exam Room: PHYS 72, starting 7:30pm]
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 8 Slide 2 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ l E q V q U W U U i f ) ( i f E l i f V V Potential energy is ability to do work
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 8 Slide 3 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ i f V V
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 8 Slide 4 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Clicker Question 1
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 8 Slide 5 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Clicker Question 1 A
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 8 Slide 6 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Superposition Principle for Potential f i l d E V 1. Cut the charge distribution into pieces 2. Calculate the contribution to the potential due to each piece 3. Use superposition to get the total potential Q i i f i i f i i V l d E l d E V E E We typically pick reference point of potential at infinity to be 0: Potential due to point charge Q (at origin) at any given point ( ) in space: r r Q r d r Q l d E l d E Q V r V r V r r r r Q Q Q V 0 2 0 4 1 4 1 ) ( ) ( ) ( |  i i r Q r V 0 4 1 ) ( i r
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 8 Slide 7 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Method 1: Divide into point charges and add up contributions due to each charge r Q V 0 4 1  Q 2 2 R z V V
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Lecture09 - PHYS 272: Matter and Interactions II - Electric...

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