What mean power should be fed to an oscillating circuit with acting resistance `R=0.45 Omega` to maintain undamped harmonic oscillations with current amplitude `I_(m)=30 m A`?

Explanation

Energy is lost across the resistance and the mean power lass is
`lt P gt = R lt I^(2) gt =(1)/(2)RI_(m)^(2)=0.2mW.`
This power should be fed to the circuit to maintain undamped oscillations.