Q. For an isochronous Hartnell governor (where r1 and r2 = Maximum and minimum radius of rotation of balls respectively, S1 and S2 = Maximum and minimum force exerted on the sleeve respectively and M = Mass on the sleeve)

• (A) mg+ S 1 mg+ S 2 = r 1 r 2
• (B) mg− S 1 mg− S 2 = r 2 r 1
• (C) S 1 S 2 = r 1 r 2
• (D) S 2 S 1 = r 1 r 2