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Force between two particles varies as F=...

Force between two particles varies as `F=K/r^2`, when k is a constant and r is their separation. Potential energy of the system is related to the force as F=-dU/dr, then U=

A

`K/r+U_0`

B

`-K/r+U_0`

C

`K/r^2+U_0`

D

`-K/r^2+U_0`

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A
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