Q7.20 (d)  A series LCR circuit with , ,   is connected to a  variable frequency supply. For which frequencies of the source is the power transferred to the circuit half the power at resonant frequency? What is the current amplitude at these frequencies?

As

Power

Power  will be half when the current  is   times the maximum current.

As,

At half power point :

here,

On putting values, we get, two values of  for which

And they are:

Also,

The current amplitude at these frequencies

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