Physics Problem - Conservation of Energy - Electric Force and Potential Energy

An electrically charged particle is held at rest at the point x = 0; a second particle with equal charge is free to move along the positive x-axis. The potential energy of the system is U(x) = C/x, where C is a positive constant that depends on the magnitude of the charges. Derive an expression for the x-component of force acting on the movable particle as a function of its position.

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