28 - Magnetism I

28 - Magnetism I - Physics 212 Fall 2009 Magnetism I...

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Unformatted text preview: Physics 212 Fall 2009 Magnetism I 11/02/09 Magnetism Gauss Law for Magnetism Ampere-Maxwell Equation Magnetism - electron magnetic dipole moment Diamagnetism Paramagnetism - Curies Law Ferromagnetism - Interacting Spins, Domains, Hysteresis Simple Model for the Earths Magnetic Field Magnetic Fields You are given a bar magnet, but the poles are not labeled. Using which of the following items can you determine which end is a north pole and which is a south pole? a) a voltmeter b) a bottle of iron particles c) a charged rubber rod d) a compass e) a steel rod Surface III B-Field from current Gauss Law for Magnetism Break a dipole get more dipoles Flux through any closed surface is zero Permanent magnet B d A = E d A = q enc Compare w/ A Charging Capacitor Capacitor Side View Capacitor End View As capacitor is charging (or discharging) the electric feld is changing dE dt Analogous to Farady, J.C. Maxwell predicted that a changing electric ux will create a magnetic feld B d s = d E dt Induced Magnetic Fields...
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28 - Magnetism I - Physics 212 Fall 2009 Magnetism I...

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