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For a system to work, as oscillator the total phase shift of the loop gain must be equal to

90°
45°
270°
360°

Correct Answer: 360°

Explanation:

Gain of system with + ve feedback = for oscillation

but V₀ ≠ 0

so, that 1 - AB = 0 ⟹ AB = 1 ∠0° or 360°.

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