Question: Find the potential energy of the gravitational interaction (a) Of two mass points of masses m1 and m2 located at a distance r from each

Find the potential energy of the gravitational interaction
(a) Of two mass points of masses m1 and m2 located at a distance r from each other;
(b) Of a mass point of mass m and a thin uniform rod of mass M and length l, if they are located along a straight line at a distance a from each other; also find the force of their interaction.

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