Solve the given parts of following question:
Question: An electric dipole moment of p = (5, -6, 4.5) Cm is inside a uniform electric field of E = (2.25, -6, 7.75) V/m.
Part I: What is the potential energy of the dipole?
Part II: What is the magnitude of the torque acting on the dipole?
I don't know how to get that answer for the above question. Please help! Thanks.