prallech19 - Chapter 19: Magnetic Forces and Magnetic...

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1 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 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
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2 Magnetic Materials An unmagnetized piece of iron can be magnetized by stroking it with a magnet Magnetism can be induced Soft magnetic materials, such as iron, are easily magnetized They also tend to lose their magnetism easily Hard magnetic materials, such as cobalt and nickel, are difficult to magnetize They tend to retain their magnetism electron Nucleus 19.2 Earth’s Magnetic Field
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3 The farther north the device is moved, the farther from horizontal the compass needle would be The compass needle would be horizontal at the equator and the
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This note was uploaded on 03/15/2010 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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prallech19 - Chapter 19: Magnetic Forces and Magnetic...

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