Originally Posted by

**dakini**
Does anybody know how to calculate quadrupole moments? I have the formula and I should get a number, but I get 0...

I've got a system of 4 charges, q at (a,b), -q at (-a,b), q at (-a,-b) and -q at (a,-b). I've tried plugging everything in and it doesn't work, does anyone know if there's a direction component in this or if it's just purely scalars... though I'm not sure that will help either. :?

If nobody knows what I'm talking about then just carry on with your lives...