A circular beam of charge of radius 10 cm moving with a constant speed u = 3.10 m/s along the +z direction. The beam's axis is coincident with the z-axis and the charge density is given by; 37 Py = 12r [C/m] where r is the radial distance from the axis of the beam. Find the current by using; 1 = [1.ds [4] and verify your result by: I=pu [A]. To get points, solve the question by clearly specifying all formulas and writing all steps of mathematical operations.