A radio tuning circuit uses a coil of inductance with a variable capacitor

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A radio tuning circuit uses a coil of inductance

L = 200\,\mu\text{H}

with a variable capacitor. When the capacitor is set at

C = 400\,\text{pF}

, the circuit is tuned to which approximate carrier frequency? (a)

1.1\,\text{MHz}

(b)

5.6\,\text{MHz}

(c)

0.56\,\text{MHz}

(d)

0.28\,\text{MHz}