In a conservative force field , we can find the radial component to force F from the potential energy function (U) using the relation F= (dU)/(dr) . Positive value of F mean repulsive force and vice-versa. We can find the equilibrium position, where force is zero. We can also calculate ioinisation energy, which is the work done to move the particle from a certain position to infinity. Let us consider a particle bound to a certain point at a distance r from the centre of the force. The potential energy function of the particle is given by U(r) = (A)/(r^(2)) - (B)/(r) where A and B are positive constants. The nature of equilibrium is