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?
- A High reactance at audio frequencies
- B High reactance at radio frequencies
- C Low reactance at radio frequencies
- D Low 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
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.