A particle located in a one-dimensional potential field has its potential energy function as \( ...

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A particle located in a one-dimensional potential field has its potential energy function as \( U(x)=\frac{a}{x^{4}}-\frac{b}{x^{2}} \), where \( a \) and \( b \) are positive constants. The position of equilibrium \( x \) corresponds to
(1) \( \frac{b}{2 a} \)
(2) \( \sqrt{\frac{2 a}{b}} \)
(3) \( \sqrt{\frac{2 b}{a}} \)
(4) \( \frac{a}{2 a} \)
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