1. The problem statement, all variables and given/known data Given a permanent dipole, call it pNO, at the origin pointing along r1 (general vector, not along any particular axis). A polarizable atom as at position r2. What is the induced dipole moment, call it pHe, of this atom in terms of pNO and r2? 2. Relevant equations pNO=a1Epar+a2Eperp a1 is the coefficient of polarizability in the direction parallel to the electric field, a2 is the perpendicular one. The second part of this expression should be zero, as the induced dipole should point in the direction of the electric field. 3. The attempt at a solution I know/understand that whatever this induced dipole is, it will point in the direction of the electric field due to the permanent dipole. Really, it's not the answer I'm after- rather, I need help with the method. Would I just say that for the permanent dipole, there is essentially a negative charge at the origin and a positive charge at p1 and superimpose the electric fields? It seems like this should work, but it's messy/tedious/not giving me the right answer, so I am probably making a wrong assumption with this method. I suppose the real problem I have is not solving for the dipole, but rather the electric field due to a general permanent dipole. I would vastly prefer a point in the direction of deriving it rather than someone just giving a formula.