The potential energy between two neutral atoms is called the Lennard-Jones potential, and is given by the equation
U(x) = A/r12 - B/r6
where A and B are positive constants.
a) What is the force due to this potential energy?
b) For what range of r is the force attractive, and for what range of r is the force repulsive? Note that if the force is positive, it is repulsive, and if the force is negative, it is attractive.
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