If the electron are moving in the +z direction with uniform with a constant speed u along the +z direction. The beam’s axis is coincident with the z axis and the electron charge density is given by rho_nu = -cr^2 (c/m^3) where c is a constant and r is the radial distance from the axis of the beam. Determine the charge density per unit length. Determine the current crossing the z-plane.

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