Consider the circuit shown in the figure. In this circuit R = 1kΩ, and C = 1μF. The input voltage is sinusoidal with a frequency of 50 H z, represented as phasor with magnitude V_i and phase angle 0 radian as shown in the figure. The output voltage is represented as a phasor with magnitude V₀ and phase angle δ radian. What is the value of output phase angle δ (in radian) relative to the phase angle of the input voltage?