The input-output transfer function of a plant (mathrm{H}(s)=frac{100}{s(s+10)^{2}}). The plant is placed in a unity negative feedback

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The input-output transfer function of a plant \(\mathrm{H}(s)=\frac{100}{s(s+10)^{2}}\). The plant is placed in a unity negative feedback configuration as shown in the figure below.

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The gain margin of the system under closed loop unity negative feedback is
(a) \(0 \mathrm{~dB}\)
(b) \(20 \mathrm{~dB}\)
(c) \(26 \mathrm{~dB}\)
(d) \(46 \mathrm{~dB}\).

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