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Two point masses of 0.3 kg and 0.7kg are...

Two point masses of 0.3 kg and 0.7kg 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

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The correct Answer is:
B
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