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The potential energy of a two particle s...

The potential energy of a two particle system separated by a distance `r` is given by `U(r ) =A/r` where A is a constant. Find to the radial force `F_(r)`, that each particle exerts on the other.

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The correct Answer is:
A, B
`F=-(dU)/(dr) =(A)/(r^(2))`.
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