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Answer to Question #48841 in Other Physics for Aditya raj

Question #48841
The potential energy of a paricle in a field is U=a/r^2-b/r, where a and b are constant. The value of r in terms of a and b where force on a particle is zero will be
(1)a/b
(2)b/a
(3)2a/b
(4)2b/a
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