Question

The principle of resonance in a series RLC circuit is used in radio tuning to ______.

Options

• Amplify all incoming radio signals equally

• Increase the resistance of the circuit

• Match the circuit's resonant frequency to a desired station's frequency

• Convert AC signals into DC signals

Answer 1

The principle of resonance in a series RLC circuit is used in radio tuning to match the circuit's resonant frequency to a desired station's frequency.

Explanation:

In a radio tuner, the capacitance is varied until the resonant frequency of the RLC circuit equals the frequency of the desired radio station. At this point, the current amplitude for that signal is maximum, allowing that particular station to be heard clearly while others are suppressed.