lecture14 - 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 ) Lec14 Slide 1/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ PHYSICS 272 Lecture 14 Atomic Structures of Magnet [EMI 18.11] Electric Fields and Circuits [EMI Ch.19]
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec14 Slide 2/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ The magnetic dipole also acts like a compass needle! In the presence of external magnetic field a current-carrying loop rotates to align the magnetic dipole moment along the field B (such that the B field due to dipole is aligned with external B ) Magnetic Dipole AI I R r z I R B 2 3 0 3 2 0 axis dipole, where 2 4 2 4
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec14 Slide 3/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ The Magnetic Field of a Bar Magnet N S
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec14 Slide 4/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Earth as a Magnet Clicker Question 1: Where is earth’s magnetic north pole? A) near geographic north pole (arctic) B) near geographic south pole (Antarctic) C) near equatorial D) near West Lafayette, IN E) not determinable
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Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec14 Slide 5/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Earth as a Magnet Clicker Question 2: Where is earth’s magnetic north pole? A) near geographic north pole (arctic) B) near geographic south pole (Antarctic) C) near equatorial D) near West Lafayette, IN E) not determinable N S Hint: where would a compass point to?
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yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lec14 Slide 6/24 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ The Magnetic Field of Earth Surface “north” component of magnetic field depends on latitude Maine: ~1.5 . 10
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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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lecture14 - PHYS 272: Matter and Interactions II - Electric...

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