Magnet Science Project Idea

Science project idea on how magnets are used.

Magnet Science Project Idea

How magnets are used.; The current of electricity passing through the coil of wire gives the iron rod around which it is wound the power of a magnet.; This kind of magnet is temporary, possessing its power only when the current of electricity is passing through the wires.; For this reason it is called an electromagnet.; Electromagnets are used in many electrical devices; among which are telephone, telegraph, and wireless apparatus, ignition system of automobiles, and in electric motors and dynamos.; Large electromagnets attached to cranes are used to lift masses of iron which may be dropped at the desired spot by simply breaking the circuit.;

The action of permanent magnets may be observed by experimenting with a common horseshoe or bar magnet.

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Magnet Science Experiment I;

Place the magnet under a piece of paper over which iron filings have been scattered.; Gently tap the paper and observe the position taken by the filings.;

Magnet Science Experiment II

Rub a needle along the magnet and move it near some fine iron filings.; What has happened to the needle?; Suspend the needle horizontally by an untwisted silk thread.; Move one end (pole) of the magnet near one end of the needle.; Reverse the magnet and approach the same end of the needle with the other pole of the magnet.; What is the result?; Allow the needle to remain suspended undisturbed.; What position does it take?; The earth itself is a great magnet; one magnetic pole being near the geographic north pole, and the other near the geographic south pole.; A magnetic needle, therefore, which swings freely will take an approximate north and south position.; What practical use is made of this fact?; The use of the compass has had a great influence upon the development of navigation.

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