Basic Qualification · B-005 Basic electronics and theory · B-005-012-008
A coil and an air-spaced capacitor are arranged to form a resonant circuit. The resonant frequency will remain the same if we:
- A add a resistor to the circuit
- B increase the area of plates in the capacitor
- C insert Mylar sheets between the plates of the capacitor
- D wind more turns on the coil
Correct answer: A — add a resistor to the circuit. From the official ISED question bank, verified word for word.
Why
Adding a resistor to the circuit changes how quickly energy fades away, but it does not alter the natural speed at which the circuit vibrates. 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.