let R=20kΩ, L=10mH, and C=40μF. Which angular frequency ω is attenuated most by this filter? (It would help you to first identify what type of filter this is.) Give your answer in terms of rad/sec, and omit units from your answer.

Answer 1

Most attenuation will occur when the current is highest.
For an LCR circuit, as is given, this occurs at the condition of resonant frequency.

For the required condition,

ω = 1/(√LC)

Plug in the values of L and C.