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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^1`, where A and B are positive constant and r is the centre of the field. For stable equilibrium, the distance of the particle is :

A

`2A//B`

B

`A//B`

C

`B//A`

D

`B//2A`

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