A small, rigid object carries positive and negative 3.00 nC charges. It is oriented so that the positive charge has coordinates (−1.20 mm, 1.40 mm) and the negative charge is at the point (1.50 mm, −1.30 mm).

(a) Find the electric dipole moment of the object.

______C* m î + _______C* m ĵ

(b) The object is placed in an electric field E = (7.80 103 î − 4.90 103 ĵ)

__________N/C.

Find the torque acting on the object.

___________N · m

(c) Find the potential energy of the object–field system when the object is in this orientation.

__________J

(d) Assuming the orientation of the object can change, find the difference between the maximum and the minimum potential energies of the system

_________. J