An electric dipole with dipole moment p = (3.00i + 4.00j) (1.24 x 1030 C m) in

Question:

An electric dipole with dipole moment p = (3.00i + 4.00j) (1.24 x 10–30 C ∙ m) in an electric field E = (4000 N/C)i.
(a) What is the potential energy of the electric dipole?
(b) What is the torque acting on it?
(c) If an external agent turns the dipole until its electric dipole moment is p = (– 4.00i + 3.00i) (1.24 x 10-30 C ∙ m), how much work is done by the agent?