PPE28_MagneticField

PPE28_MagneticField - Magnetism Magnetic Fields RHJansen...

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© RHJansen Magnetism Magnetism Magnetic Fields Magnetic Fields
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© RHJansen Magnetic Fields Moving charges cause magnetic fields . Magnets have two poles (ends) North is analogous to positive charge in electricity South is analogous to negative charge in electricity The magnetic field of one magnet applies a force on another magnet. The rules of attraction are similar to electricity Opposites ( N and S ) attract Like poles ( N and N ) ( S and S ) repel We will look at three types of magnets Fixed Magnets : Typical magnets you are familiar with (bar and horseshoe magnets, etc.) Moving charges : Protons, electrons, and ions. Current carrying wires : A current consists of many moving charges. © RHJansen
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© RHJansen Fixed Magnets (such as bar magnets) All substances contain moving electrons in their orbits around the nucleus of the atoms in the substance. However, the way the electrons load the energy levels influences if an atom acts as a magnet or not. Paper is not magnetic. The net magnetism is canceling out. Iron is a well known magnetic substance . The net magnetism of all the moving electrons does not cancel, and each atom of iron is a tiny magnet. Why then does not everything made of iron act magnetic? A piece of iron can be divided into sections called domains. If the atoms (magnets) point one way
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This note was uploaded on 07/21/2009 for the course PHYSICS 7B taught by Professor Packard during the Spring '08 term at Berkeley.

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PPE28_MagneticField - Magnetism Magnetic Fields RHJansen...

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