The potential energy of a particle in a force field is \( U=\frac{A}{r^{2}}-\frac{B}{r} \), wher....
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0The potential energy of a particle in a force field is
P
\( U=\frac{A}{r^{2}}-\frac{B}{r} \), where \( A \) and \( B \) are positive constants
W
and \( r \) is the distance of particle from the centre of the field. For stable equilibrium, the distance of the particle is
(1) \( \mathrm{B} / 2 \mathrm{~A} \)
(2) \( 2 \mathrm{~A} / \mathrm{B} \)
(3) \( \mathrm{A} / \mathrm{B} \)
(4) \( \mathrm{B} / \mathrm{A} \)
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