A series RLC circuit (L = 24 mH, C = 40 μF, and R = unknown) has an AC generator with frequency f = 310 Hz and amplitude E_max = 120 V. The peak instantaneous current in the circuit is I_max = 1.4 A.
What is φ = the phase angle between the driving EMF and the current in the circuit? Define φ to be positive if the voltage leads the current and φ to be negative if the current leads the voltage.

φ = degrees