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## Homework Statement

Griffiths offers this problem: two point dipoles p1 and p2 are given.They are r distance away and they are perpendicular.We are asked to find torue of p1 (about p1's centre) due to p2 and vice versa.

Well, the situation is that I knoe it is =p cross E

even I know the formula for a point dipole pointing in the z direction:

E_dip=(1/(4*pi*epsilon))(p/r^3)[2cos(theta) (r^)+sin (theta) (theta^)

where (r^) and (theta^) are the unit vectors in a polar system coincident with the xyz system.

I can surely find the result for 1 part.Assuming p1 points in the z direction,it can be evaluated.What could be done in the second case?