# Q7.20 (a)  A series LCR circuit with , ,   is connected to a  variable frequency supply.What is the source frequency for which current amplitude is maximum. Obtain this maximum value.

The inductance of the inductor

The capacitance of the capacitor

The resistance of the resistor

Voltage supply

Frequency of voltage supply

As we know,

the current amplitude is maximum at the natural frequency of oscillation, which is

Also, at this frequency,

SO,

The maximum current in the circuit :

Hence maximum current is 14.14A.

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