Finding the equilibrium distance Rsub0 using total energy.

[joemmonster]

Homework Statement

Using the total energy, solve for the equilibrium distance R₀

α is given and other constants such as permitivity ε₀, avogrado, N, and charge q.

Homework Equations

U_total=-Nα(q²/4piε₀)(1-ρ/R₀)

The Attempt at a Solution

Tried to plug the values but I can't solve for R₀ since ρ is not given.

 

[haruspex]

I am confident that there was more to the problem statement than that.