A Kitchen Course in Electricity and Magnetism by David Nightingale & Christopher Spencer

Author:David Nightingale & Christopher Spencer
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(Note that many so-called copper and nickel coins are in fact iron or steel or zinc with a copper or a nickel plating: for example, in the USA, since 1982; the UK since 1992; the Euro since inception; and the Canadian nickel.)

3.8 Shielding

A magnetic field can be shielded by certain materials, and this we can show in the kitchen.

Iron and steel are very permeable to magnetic fields, which means that they are very accepting of the lines of force. Magnetic fields tend to concentrate in these materials, and so we say that the materials have high permeability.

If we surround a magnetic compass with iron, as in the right-hand side of Fig. 3.11, the field should be concentrated in the iron itself, leaving a negligible field beyond.

Fig. 3.11The compass (left photo) is affected strongly by the field of the kitchen magnet, but in the right photo, an iron cooking pot has shielded the compass, which now points in no particular direction

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