72. Two point charges. + Q and -Q of mass m. are placed on
Chapter 16, Problem 72(choose chapter or problem)
72. 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.
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