Correct choice is (b) 16
Explanation: The phase angle is the angle between the source voltage and the current. Phase angle θ=tan^-1(VL/VR). The values of VL = 20V and VR = 70V. On substituting the values in the equation, phase angle in the circuit = tan^-1(20/70)=15.94^o≅ 16^o.
