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Electrical Applications 2 by David W. Tyler

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60 Materials and their applications in the electrical industry
0.1 mm may be used at frequencies of up to about
MHz. For fre-
quencies higher than this, since the eddy current losses are pro-
portional to the frequency squared, these may be considerable even
with the thinnest laminations. Thus dust or ferrite cores are used up
to about
MHz in communications equipment. In ultra-high fre-
quency applications, air cores may have to be resorted to, since air
suffers no hysteresis or eddy current losses. Figure 4.29 shows a
small coil with a ferrite or dust core which is threaded. It may be
screwed into or out of the