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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
10
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
150
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