Question

what is the core used in a very high frequency devices?​

Answer 1

Answer: ferrite core

Explanation: the ferrite core can radiate signals from the range 1kHz to 300 kHz which makes it the most commonly used core in high frequency devices.

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Answer 2

ANSWERッ

The ferrite cores used for signals have a range of applications from 1 kHz to many MHz, perhaps as much as 300 MHz, and have found their main application in electronics, such as in AM radios and RFID tags.