The polar diagram of a conditionally stable system for open loop gain (K=1) is shown in figure.

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The polar diagram of a conditionally stable system for open loop gain \(K=1\) is shown in figure. The open loop transfer function of the system is known to be stable. The closed loop system is stable for

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(a) \(\mathrm{K}(b) \(\mathrm{K}(c) \(\mathrm{K}(d) \(\mathrm{K}>1 / 8\) and \(\mathrm{K}

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