South or north poles never occur individually every

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Unformatted text preview: differentiation is made between permanent magnetism and electromagnetism. A simple illustration of magnetic field lines in space can be achieved by means of iron filings. To give an example, iron filings placed on a sheet of paper with a magnet underneath will be activated into the lines of the magnetic field. Even small compass needles can be used for the detection of field lines. 11.2.1 Permanent magnetism If the dynamic effects of the poles of two separate permanent magnets are compared when they are brought together they can either attract or repel. Similar poles (e.g. two north poles) repel one another, whereas opposite poles (e.g. a north and a south pole) attract one another. S N N N S N Fig. 11.2.1: Illustration of field line pattern with similar and opposing magnetic poles © Festo Didactic GmbH & Co. KG • FP 1110 167 11. Physical fundamentals The field lines of a magnet are closed lines which run from the north pole to the south pole. South or north poles never occur individually; every magnet always has two poles. Permanent magnets are made of various materials: • Hard ferrite magnets • Metallic alloy magnets...
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