Magnetic moment between 2 bar magnets

[JGBuck94]

Homework Statement

A bar magnet floats above another bar magnet. The first has mass u₁ and magnetic moment m₁=m₁k^{^} and is on the ground. The second has mass u₂ and mag. moment m₂=-m₂k^{^} and is a distance z above the ground, find z

2. Homework Equations
I assume I need to calculate the magnetic force between the 2 and equate that to the gravitational force, so;
B_dip(r)=(u₀/4pi*r³){3(m.r^{^})r^{^}-m}
and F_B=IBw
and F_g=-u₂g

The Attempt at a Solution

I'm not entirely sure how to begin this question, I think I need to balance out the gravitational force and magnetic force to find the equilibrium position of the floating bar magnet and the magnetic moments will superpose because of the uniform magnetic field, my main problem is using that equation for the magnetic field, I haven't seen it before and I am just going by Griffiths which seems to imply this equation will only work with a circular loop (?)

 

[BiGyElLoWhAt]

This might help.
https://en.wikipedia.org/wiki/Magnetic_dipole–dipole_interaction
The equation looks like a monster, but it should simplify pretty nicely with all the cross products.
This looks like it actually gives you two methods to solve the problem. Both are probably equally involved.

 

[BiGyElLoWhAt]

So, I think the I is from the electron orbits, and it'd be a sum of all of them. I think that's taking it too far. You have the moments, and you have the mass, and you know g. Just balance the forces or use energy or whatever (I guess you'll still end up using forces, ultimately).