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The potential energy of a particle in a ...

The potential energy of a particle in a force field is:
`U = (A)/(r^(2)) - (B)/(r )`,. Where `A` and `B` are positive
constants and `r` is the distance of particle from the centre of the field. For stable equilibrium the distance of the particle is

A

`B/2A`

B

`2 A/B`

C

`A/B`

D

`B/A`

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