A thin rod of mass M and length L is bent in a semicircle as shown in figure
Channel: Doubtnut
Date: 2020-02-02

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?