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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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  1. Torque depends on the orientation of the dipole in relation to the E field.
    In a vector sense, torque=qL X E (Where X means cross product)

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    bobpursley

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