A series of 12 semi-infinite lines of charge are arranged with their endpoints arranged on a clock face, the numbers of which lie on a circle of radius r0, as illustrated in the diagram on a separate document (listed just below the Exam 2 document). The linear charge density is given by N*, where N is the number on the clock face, and (r) = 0(r0/r). Determine the magnitude and direction of the electric field at point P, located at the center of the clock face. Hint: Take as much advantage of the symmetry in the problem as you do the superposition for determining the electric field