The stiffness of spring \(k\) used in the Hartnell governor as shown in the given Fig. 84 ( \(F_{1}\) and \(F_{2}\) are centrifugal forces at maximum and minimum radii of rotation \(r_{1}\) and \(r_{2}\) respectively) is

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+ a a a F-F (b) 2 b (d) 2 b 2(6) ( F + F 1-12 (a) 2 (c) 2 a a E-F 1-12 F + F 1-12 Fig.84