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E6D07

What is the usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for the frequency being used?

SelectAnswer
AFrom less than 20 Hz to approximately 300 MHz
BFrom approximately 10 Hz to no more than 3000 kHz
CFrom a few kHz to no more than 30 MHz
DFrom about 100 kHz to at least 1000 GHz