15 - Magnetic Fields I

# 15 - Magnetic Fields I - PHYS 212 FALL 2009 Magnetic Fields...

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PHYS 212 FALL 2009 Magnetic Fields Magnetic Forces 9/28/09

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Magnetic Forces It is observed that objects attract or repel each other or attract bits of iron Like poles repel Opposite poles attract Dipoles can be in oriented in many different directions
Magnetic Fields A magnetic feld (B) is a property o± the material vector feld Field Lines Direction o± B is tangent to feld line Magnitude o± B lines/area emanate ±rom N pole enter at S pole go through material B

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Magnetic Shapes Smallest unit is a dipole no monopole (no magnetic charge) Horseshoe magnet “C” magnet creates uniform Feld quadrupole magnet
Earth’s Magnetic Field The Earth can be considered a giant dipole Compass is a tiny magnet It aligns with the magnetic feld lines recall a dipole in a feld ±eels a torque can use a compass to “map out” feld distribution

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What is the direction of the magnetic ±eld at the point P, directly below a point at the center of the magnet? The numbered arrows represent various directions. Direction “1” is to the right, “2”
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## This note was uploaded on 10/03/2011 for the course PHYS 212 taught by Professor Tedeschi during the Fall '08 term at South Carolina.

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15 - Magnetic Fields I - PHYS 212 FALL 2009 Magnetic Fields...

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