Radio receivers are usually tuned by adjusting the capacitor of an LC circuit. If C = C₁ for a frequency of 600 kHz, then for a frequency of 1200 kHz one must adjust C to: A) C₁/2 B) C₁/4 C) 2C₁ D) 4C₁

Question

Quizplus · Accepted Answer

The frequency of an LC circuit is inversely proportional to the square root of the product of the inductance (L) and capacitance (C). For a frequency of 1200 kHz, the capacitance needs to be halved to achieve resonance, since frequency is doubled. Therefore, the answer is option B, which is C₁/4.

Radio Receivers Are Usually Tuned by Adjusting the Capacitor of an LC