a) Find the charge density for both the rod and the arc.charge density of the rod b)charge density of the arc aa- 28 nC,Consider The rectangular arrangement of four point charges shown in Figure 1, where they lie on the corners of the rectangle where q134 nC, q39231 nC and q4=-31 nC and a =19 ст.a) Calculate how much work is required to set up the arrangement if the charges are initially infinitely far apart and were at rest. (Hint: Use therelation between work done by the external agent and total electrical potential energy of the system)Net workdoneK9.

93 a a Consider The rectangular arrangement of four point charges shown in Figure 1, where they lie on the corners of the rectangle where q1 = 28 nC, q2 = 34 nC, q3 = 31 nC and q4 = -31 nC and a = 19 cm. a) Calculate how much work is required to set up the arrangement if the charges are initially infinitely far apart and were at rest. (Hint: Use the relation between work done by the external agent and total electrical potential energy of the system) Net workdone

93 a a Consider The rectangular arrangement of four point charges shown in Figure 1, where they lie on the corners of the rectangle where q1 = 28 nC, q2 = 34 nC, q3 = 31 nC and q4 = -31 nC and a = 19 cm. a) Calculate how much work is required to set up the arrangement if the charges are initially infinitely far apart and were at rest. (Hint: Use the relation between work done by the external agent and total electrical potential energy of the system) Net workdone