Assume the frequency of a resonant circuit is varied with a varactor that has a minimum capacitance of 5 pF and a maximum capacitance of 50 pF. The ratio of highest to lowest frequency the circuit can tune is
A)greater than 10
B)10
C)less than 10

Question

Quizplus · Accepted Answer

The resonant frequency of a circuit is inversely proportional to the square root of the capacitance. Therefore, the ratio of the highest to lowest frequency is the square root of the ratio of the lowest to highest capacitance, which is sqrt(50/5) = sqrt(10), which is less than 10.

Assume the Frequency of a Resonant Circuit Is Varied with a Varactor