Question

Consider an electric dipole whose dipole moment (a vector pointing from the negitive charge to the positive charge) is oriented at angle with respect to the y axis. There is an externalelectric field of magnitude (independent of the field produced bythe dipole) pointing in the positive y direction. The positive and negative ends of the dipole have charges and , respectively, and the two charges are a distance apart. The dipole has a moment of inertia about its center of mass. It will help you to imagine that the dipole isfree to rotate about a pivot through its center.
A) What is the net force $F_net_vec$ that the dipoleexperiences due to the electric field?B) What is $tau_cm(theta)$ , the magnitudeof the torque that the electric field exerts about the center of mass of the dipole?
C) Using the above result, find the potential energy associated with the dipole's orientation in the field as a function of the angle shown in the figure. Take the zero of the potential to occur when the dipole is at angle ; that is, .D) In terms of the dipole moment $P_vec$ , which of thefollowing is an expression for the torque on a dipole in the field $E_vec$ ?
E) In terms of the dipole moment $P_vec$ , which of thefollowing is an expression for the potential energy of a dipole in the field $E_vec$ ?I am looking for an explanation, not simply the answers.

Answer 1

a) fnet=0