Question

In the circuit shown in figure , the supply has a constant rms value V but variable frequency f. The frequency at which the voltage drop across R is maximum is

A. 100 Hz
B. 500 Hz
C. 300 Hz
D. None of these

Answer 1

Correct Answer - B
(b) Voltage drop across R is maximum at resonance, i.e., at
`omega = 1/sqrt (LC) or f = omega/(2pi) = 1/(2pi sqrt (LC))`
`= 1/(2pi sqrt ((1/pi)(1/pixx10^(-6))) = 500 Hz`