Two point charges, +Q and -Q of mass m, are placed on the
Chapter 16, Problem 65GP(choose chapter or problem)
Problem 65GP
Two point charges, +Q and -Q of mass m, are placed on the ends of a massless rod of length l, which is fixed to a table by a pin through its center. If the apparatus is then subjected to a uniform electric field E parallel to the table and perpendicular to the rod, find the net torque on the system of rod plus charges.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer