1. The problem statement, all variables and given/known data We have an electric dipole with moment P=2*[/-5] pointing in x direction. What is the force experieced by dipole at origin when a point charge Q=3*[/-4] is located at (0.014 m ,0,0) 2. Relevant equations 1. [E][/dipole]=(1/4π[ε][/0])(2p/r3) 2. p=qs 3. F=qE 4. τ=pEsinϑ 3. The attempt at a solution I know that the [E][/dipole] can be calculated by the given formula. Then after that I can find force by F=E*r(distance between dipole center and point charge). The problem is that the point charge is located in the line along x. Does the formula change in this case. My book gives no explanation on the way the formulas are derived even thought I self learned some of them.