A simple method of mapping the rough form of a magnetic ar is to use iron filings. Because that example, the magnetic ar pattern that a bar magnet have the right to be recognize by covering it with a piece of document and scattering steel filings over the paper.
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As the filings room scattered about the magnet they become temporary magnets (by magnetic induction) and also line up end-to-end. The filings have tendency to clump together approximately the poles the the magnet, indicating the this is whereby the magnetic field is strongest. The present of stole filings give an impression that the lay-out of the magnetic field, but it is essential to remember the what you have prior to you through the iron filings is not a magnetic field pattern. As suggested earlier, the magnetic ar pattern is a theoretical construction, a kind of graph which can be attracted to plot the layout the magnetic fields.
An alternative method to map a magnetic field is to usage one or more plotting compasses. The plotting compass itself consists of a an extremely small, suspended magnetic needle. If the plotting compass is inserted in the magnetic field of a bar magnet, the needle will certainly line up such that its phibìc pole is attractive to the south pole the the magnet. By put the plot compass in nearby positions in the field it is feasible to map out some magnetic currently of force.
Using a plotting compass enables the direction that the field to be identified, v the needle of the compass pointing follow me the field lines from north to south. The plotting compass technique, however, provides less impression of the toughness of the magnetic field than the steel filings technique, wherein the filings clearly clump around the poles.
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Exploring magnets - Physics narrative
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