Basic Qualification · B-005 Basic electronics and theory · B-005-010-007
What property allows a coil wound on a ferrite core to mitigate the effects of an offending radio signal?
- AHigh reactance at audio frequencies
- BHigh reactance at radio frequencies
- CLow reactance at radio frequencies
- DLow reactance at audio frequencies
Correct answer: B — High reactance at radio frequencies. From the official ISED question bank, verified word for word.
Why
A ferrite core increases a coil's opposition to changing current, a property called reactance, specifically at high speeds like radio frequencies. The full explanation — and one for every question — is in Pro.
Practise this section
Basic electronics and theory is section B-005 of the Basic exam: The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.
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