phy19 - Chapter 19: Magnetic Forces and Magnetic Fields...

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1 What do they have in common? Worms, Insects Loud speaker, microphone, earphone Hard drive Credit card Video/audio tape Floppy/zip disk Electric generator/motor Bullet train Preinstalled software (modern microwaves, ovens, watches, calculators, palm pilots, …) MRAM Antilock break Hybrid cars; the list goes on and on… Chapter 19: Magnetic Forces and Magnetic Fields 19.1 Magnets A magnet always has a north pole and a south pole at the same time Like poles repel and unlike poles attract N S N S N S Break it up animation Magnetic poles cannot be isolated
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2 Magnetic Field Lines Bar Magnet Unlike Poles Like Poles Magnetic field is a vector quantity, symbolized by B Similar to the field of a positive and a negative charge (electric dipole) Similar to electric fields between parallel plates Magnetic Field Lines
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3 Magnetic Materials An unmagnetized piece of iron can be magnetized by stroking it with a magnet Magnetism can be induced
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phy19 - Chapter 19: Magnetic Forces and Magnetic Fields...

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