A Theremin is a musical instrument with an LC circuit operat

A Theremin is a musical instrument with an LC circuit operating at 173.4 kHz, L=598 microH, C=55.5 nF, fret=173.4kHz , C=variable, fvar=?, fout=fret-fvar. when your hand is very close to the antenna, fvar=171.6 what is the value of the variable capacitor?

Solution

This question is not complete as you are taking C=55.5nF and also C=variable,How is it possible?perhaps this is the value before disturbance,then:

Now circuit frequency is given=173.4 KHz

Fout=173.4-171.6=1.8KHz

L=598microH=598*10^-9KHz

now C=L squ.root(2*pi*Fout)=2009.28*10^-9 kF