Lecture%2022A - Physics 1B Lecture 22A History of Magnets...

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Unformatted text preview: Physics 1B Lecture 22A History of Magnets Magnets were discovered by early man. Asia Minor has region known as Magnesia where rocks would attract each other. Early researchers found that if you put a magnet on a string it would want to face a certain direction (i.e. towards the North Pole). Thus, magnets were used as compasses. Later on it was discovered that magnets will only attract iron or other very select metals (cobalt, nickel, etc.). History of Magnets Researchers also found that magnets always came with two sides: a north pole and a south pole. North poles attract south poles. But north poles repel north poles and south poles repel south poles. With the aid of compasses, agnetic field lines were mapped or simple shapes of magnets. It was defined that magnetic ield lines exited the north end nd entered the south end. History of Magnets Magnetic field lines are actually easier to visualize than electric field lines. Just put some iron filings next to a magnet and they will align themselves with the magnetic field. History of Magnets But it was later discovered that inside the physical magnet the magnetic field lines actually moved from south to north. This means that magnetic field lines (unlike electric field lines) always form endless loops. If a particle were to follow a magnetic field line it would eventually come back to the same location. History of Magnets Many similarities between magnetism (MG) and electrostatics (ES) were found: (ES): Two types of charges, + and . (MG): Two types of poles (north and south). (ES): Like charges repel, opposite charges attract. (MG): Like poles repel, opposite poles attract. (ES): Can move objects at a distance. (MG): Can also move objects at a distance. History of Magnets There are also many differences between magnetism (MG) and electrostatics (ES): (ES): Can separate a + away from a ....
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This note was uploaded on 01/30/2012 for the course PHYSICS 1B 1B taught by Professor Grosmain during the Winter '10 term at UCSD.

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Lecture%2022A - Physics 1B Lecture 22A History of Magnets...

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