Consider two electric dipoles p1 and p2 located at the origin (0, 0, 0) and on the x-axis at (a, 0, 0) respectively. p1 points in the x-direction: p1 = p^i and p2 points in the z-direction: p2 = p^k
If p1 is held fixed, what is the direction of the torque on p2 ?
If p2 is held fixed, what is the direction of the torque on p1 ?
If both dipoles are free to rotate, what are their orientations at static equilibrium?