If a Nyquist plot of G (jω) H (jω) for a closed loop system passes through (-2, j0) point in GH plane, what would be the value of gain margin of the system in dB?

If a Nyquist plot of G (jω) H (jω) for a closed loop system passes t

1.	If a Nyquist plot of G (jω) H (jω) for a closed loop system passes through (-2, j0) point in GH plane, what would be the value of gain margin of the system in dB?
A.	0 dB
B.	2.0201 dB
C.	4 dB
D.	6.0205 dB
Answer» E.