# Differentiation of potential energy

1. Homework Statement

The potential energy of a system of two particles separated by a distance r is given by U(r) = (A)/(r^4), where A is a constant. Find the radial force that each particle exerts on the other. (Use A and r as appropriate in your equation.)

2. Homework Equations

F=-dU/dx
U is potential energy

3. The Attempt at a Solution

i figured out the antiderivative of U(r) is -(A)/(3*r^(3)) but it isnt the correct answer.
what else do u need to do besides the antiderivative which is equal to force. since it is 2 particles should i divide the U(r) funciton by 2?

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