please answer

20. A series LCR circuit with L = 0.12 H, 2AC = 480 nF, R = 230 is connected to a 230 V variable frequency supply. a) What is the source frequency for which current amplitude is maxi- mum. Obtain this maximum value. b) What is the source frequency for which average power absorbed by the circuit is maximum. Obtain the value of this maximum power. c) 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 ? d) What is the Q-factor of the given circuit