Basic Qualification · B-005 Basic electronics and theory · B-005-009-005
You are constructing an air-core inductor using a coil of wire. What parameters determine its inductance?
- A Coil diameter, coil length and operating frequency
- B Type of wire, coil length and number of turns of wire
- C Coil diameter, coil orientation and number of turns of wire
- D Coil diameter, coil length and number of turns of wire
Correct answer: D — Coil diameter, coil length and number of turns of wire. From the official ISED question bank, verified word for word.
Why
An air-core inductor's ability to store magnetic energy depends on its physical shape: a wider coil diameter, a shorter coil length, and more turns of wire all increase the inductance. 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.