In a feedback control system, phase margin(PM) is 1. Directly proportional to G 2. Inversely proportional to G 3. Independent of G 4. Zero when G =0. Which of the above statements are correct?

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In a feedback control system, phase margin(PM) is 1. Directly proportional to G 2. Inversely proportional to G 3. Independent of G 4. Zero when G =0. Which of the above statements are correct?