Discuss grow and decay of current in L-R ckt?

What is the phase difference between voltage and current in L-C-R circuit at resonance?

Does the steady state current in RL circuit depend upon L.

A pn junction diode when forward biased has a drop of 0.5 V and independent of current flowing trhough it. The maximum bearable current is 10 mA. Calculate the value of R so the current through the circuit is 5 mA.

The amplitude of current in series LCR circuit connected to an AC frequency "omega" is given by i_m = v_m/(sqrt(R^2+(X_L-X_C)^2) Where X_L and X_C are inductive and capacitative reactances respectively and "v_m" is amplitude of voltage. Starting fron this equation show that sharpness of resonance in the circuit is equal to the quality factor of the circuit.

Calculate the phase difference between voltage and current at resonance in L-C-R circuit