5. Consider a unity negative feedback system with the forward transfer function G(s): K(s + 3) (s(s+ 2)(s + 4)(s + 10)) G(s) = B. Find the range of K at which the system is stable.

B-6-14. Consider the unity-feedback system whose feed- forward transfer function is G(s) F K s(s+ 1) The constant-gain locus for the system for a given value of K is defined by the following equation: K s(s + 1) = 1 Show that the constant-gain loci for 0 ≤ K ≤ ∞ may be given by [o(o + 1) + w²]²+ w² = K² Sketch the constant-gain loci for K = 1, 2, 5, 10, and 20 on the s plane.

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Draw the electric field lines for the field generated by the four charges of the figure. +q +q -q -q