2049_ch28A - Chapter 28: Magnetic Fields PHY2049: Chapter...

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PHY2049: Chapter 28 1 Chapter 28: Magnetic Fields
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PHY2049: Chapter 28 2 Magnetic Fields Î Magnetic field (units, field lines) ± Magnetic field of the earth and other astronomical objects Î Effects of magnetic fields on charges and currents ± Force on a moving charge ± Force on a current ± Torque on a current loop ± Path followed by particle in magnetic field Î Instruments ± Mass spectrometers ± Cyclotrons and synchrotrons
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PHY2049: Chapter 28 3 Reading Quiz Î When I cut a magnet into two pieces I get: ± An isolated north and south magnetic pole ± Two smaller magnets ± The two pieces are no longer magnets
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PHY2049: Chapter 28 4 Bar Magnets Î Two poles: “north” and “south” Î Like poles repel Î Unlike poles attract Î Magnetic poles cannot be isolated
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PHY2049: Chapter 28 5 Magnetic Monopoles? Î Can any isolated magnetic charge exist? ± We would call this a “magnetic monopole” ± It would have a + or – magnetic charge Î How can we isolate this magnetic charge? ± Cut a bar magnet in half? NO! No one has ever found magnetic monopoles in nature Listen to Magnetic Monopoles Song: h ttp://www.haverford.edu/physics-astro/songs/monopoles.htm What you get is a bunch of little magnets!
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PHY2049: Chapter 28 6
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PHY2049: Chapter 28 7 Bar Magnets (2) N S Similar to dipole field from electrostatics
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PHY2049: Chapter 28 8 Earth is a big magnet!! Earth’s magnetic poles have reversed very frequently on a geological time scale: http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm The North pole of a small magnet (compass) points towards geographic North because Earth’s magnetic South pole is presently up there!!
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PHY2049: Chapter 28 9 What Causes Magnetism?
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This note was uploaded on 04/12/2008 for the course PHY 2049 taught by Professor Any during the Fall '08 term at University of Florida.

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2049_ch28A - Chapter 28: Magnetic Fields PHY2049: Chapter...

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