A thin rod of mass M and length L is ben...

A thin rod of mass M and length L is bent in a semicircle as shown in figure (a). What is its gravitational force (both magnitude and direction) on a particle with mass m at O the centre of curvature ? (b) what would be the force on m if the rod is in the form of complete circle?

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The correct Answer is:

(a) `(2piGaM)/(L^(2))`, (b) `0`

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