66. Two point masses of 0.3 kg and 0.7 kg are fixed at the ends of a rod of length 1.4 m and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum is located at a distance of
(a) 0.4 m from mass of 0.3 kg
(b) 0.98 from mass of 0.3 kg
(c) 0.70 m from mass of 0.7 kg
(d) 0.98 m from mass of 0.7 kg
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a