Thread: 204 Simple Science Experiments ~ {ERG}
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Old 05-18-2008, 02:32 PM
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Default Re: 204 Simple Science Experiments ~ {ERG}
32. Mysterious Circles




Push a length of copper wire through a piece of cardboard laid horizontally and connect the ends of the wire to a battery. Scatter iron filings on to the cardboard and tap it lightly with your finger. The iron filings form circles round the wire. If a direct current is passed through a wire or another conductor, a magnetic field is produced round it. The experiment would not work with an alternating current, in which the direction of the current changes in rapid sequence, because the magnetic field would also be changing continuously.