The Nyquist plot of loop transfer function G(s) H(s) of a closed loop control system passes through the point (-1, j0) in the G(s) H(s) plane. The phase margin of the system is:

The Nyquist plot of loop transfer function G(s) H(s) of a closed loop

1.	The Nyquist plot of loop transfer function G(s) H(s) of a closed loop control system passes through the point (-1, j0) in the G(s) H(s) plane. The phase margin of the system is:
A.	0°
B.	45°
C.	90°
D.	180°
Answer» B. 45°