Question

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Answer 1

Explanation:

Let the point masses be p1,p2,p3......pa.................(a>0, a is integer)

Now potential at x=0 due to p1 be 

P1=1−GM 

Similarly P2=2−GM, P3=4−GM, ........

So, total potential is given by

P=P1+P2+P3+.........

P=1−GM+2−GM+4−GM+8−GM+................

P=−GM(1+21+41+81+........

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