Question

6:14 PM Tue Jul 14 3 78% Document (71) 1 Home Insert Draw Layout Review View Calibri Regular (B 11 B I U A. 'L Q1. (40 points) One rod and one disk are placed as shown. Point A is at 30 cm from the center of the rod. The distance from A to the disk is 20 cm. The rod is 20 cm long with uniform charge density 2 = +60°C/m. The disk has uniform charge density of a = -200 uC/m2 and radius 15 cm. A)) Calculate the electric field vector due to the rod at the point A. b)) Calculate the electric field vector due to the disk at the point A. c)) Calculate the net electric field vector at the point A. d) (10 points) If a charge q" = -8 nC is placed at the point A, calculate the net electric force on it.

Answer 1

A A L= qocam L A = 460 Helm Ke o &= 0 + 6 =12 a = 600obxz0x102 EA = 12 uc C محرم و a (+a) Gaynor 9x109 x 12x156 a=20can. 20x112 20x10²4 [ko + 29x15 ² EA = 1350000 ? (N/C) due to Rod Rod. -6 200X10 leset 4200 x 16h -12 due to disc EA B 2x8,85xio Ex = 011299435.03 î(Wic). (Exet) A = (Fred) A + Core) А A N/c = 12649435,03 (a P = q Enet -9 -8810 x 12649435.03 N 7) o.rolla5 N