22 Faraday - Craig Ogilvie Craig Ogilvie 11 Summary Lecture...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Summary Lecture 21 Phenomenon Cause Affect on B-field Induced magnetic moments opposite direction to B repelled from strong field Permanent magnetic moments line up same direction as B attracted to strong field Permanent magnetic moments same direction to B Causes other atoms to also line up with B Paramagnetic Diamagnetic Ferromagnetic 1 = m ext m total K B K B Craig Ogilvie Craig Ogilvie 22 Demo No physical connection between magnet and metal ring. No battery or power source in circuit Current in loop when B-field through loop increased, or decreased must be an voltage, emf present to cause this current! Craig Ogilvie Goal for today Understand this phenomenon Faradays law of induction Craig Ogilvie 33 Craig Ogilvie Craig Ogilvie 44 Magnetic Flux = A d B B dA is normal to surface Surface does not have to be closed Craig Ogilvie Flux: 1st round Craig Ogilvie 55 Two infinitely long wires each carry current i....
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This note was uploaded on 09/20/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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22 Faraday - Craig Ogilvie Craig Ogilvie 11 Summary Lecture...

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