The potential energy of a particle in a force field is $$U=$$$\frac{A}{{r}^{2}}-\frac{B}{r}$ where $$A$$ and $$B$$ are positive constants and $$r$$ is the distance of the particle from the center of the field. For stable equilibrium, the distance of the particle is:

 1 $$\frac{B}{A}$$ 2 $$\frac{B}{2A}$$ 3 $$\frac{2A}{B}$$ 4 $$\frac{A}{B}$$

Subtopic: Â Potential Energy: Relation with Force |
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From NCERT
AIPMT - 2012
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The potential energy of a system increases if work is done:

 1 by the system against a conservative force 2 by the system against a non-conservative force 3 upon the system by a conservative force 4 upon the system by a non-conservative force

Subtopic: Â Potential Energy: Relation with Force |
Â 67%
From NCERT
AIPMT - 2011
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