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A point particle of mass M is attached to one end of a massless rigid non-conducting rod of length L. Another point particle of the same mass is attached to other end of the rod. The two particles carry charges +q and –q respectively. This arrangement is held in a region of a uniform electric field E such that the rod makes a small angle θ (say of about 5°) with the field direction (Fig 23). What will be the minimum time needed for the rod to become parallel to the field after it is set free?