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For a conservative unidimensional force field \( \mathrm{F}_{\mathrm{x}}=-\frac{\mathrm{dU}}{\mathrm{dx}} \), the unstable equilibrium position is
\( \mathrm{P} \) to be calculated.
Information \( I: \mathrm{F}_{\mathrm{x}}=0 \) at \( \mathrm{x}=1 \).
Information II : \( \frac{\mathrm{d}^{2} \mathrm{U}}{\mathrm{dx}^{2}} \) is negative at \( \mathrm{x}=1 \).
(1) Question can be solved by information I only
(2) Question can be solved by information II only
(3) Question can be solved by information I \& II together only
(4) Question cannot be solved by using these information only
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