Hi, I am sort of new to Physics forum but I am urgently in need of help. It would be very much appreciated if you could clear my confusion. Let me break them down into bullet points instead of one giant paragraph. 1.Dipole moments are vector quantities. I can just add them up like I do to forces? 2. Does dipole have to be composed of 1 positive and 1 negative charge? Can it be two positive charges? Right now I am trying to compute the dipole moment of a cluster of atoms in a specific shape discretely and then continuously. 3.For the discrete part, I want to know whether if it's correct to treat each pair of atoms(in my case, they are ions+) with a dipole moment with a direction pointing somewhere, and then add them up like vectors of force? 4.For continuous part, I must integrate it over a volume. I don't understand the equation P(r) = integral of p(r0) (r0 - r) dr^3. what is p(r0)*(r0 - r) r0 = r zero = r initial i think? What if my charge distribution is constant and uniform? Does that mean I can pull it out and times the volume of the shape? Thank you.