A long, thin rod (length = 4 m) lies along the x axis, withits midpoint at the origin. In a vacuum, a +8 microC pointcharge is fixed to one end of the rod, and a -8 micro C pointcharge is fixed to the other end. Everywhere in the x, yplane there is a constant external electric field (magnitude= 5.0 x103) that is perpendicular to the rod. Withrespect to the z axis, find the magnitude of the net torque applied to the rod.