Question

Question 2 The figure provided shows a section of a very long rod of radius a = 2.38 mm and linear charge density 339 nC/m. The rod is inside a coaxial cylindrical shell of radius b= 10.7 mm and linear charge density-7.94 nCm. What is the magnitude and direction of the electric field at a radial distance of 6.18 mm? Magnitude: Direction: O Outward Inward What is the magnitude and direction of the electric field at a radial distance of 17.5 mm? Magnitude: Direction: O Inward O Outward

Answer 1

"a) From Gauss law: E (2piR) = 3.39 times 10^-9/8.85 times 10^-12 E = 3.39 times 10^-9/8.85 times 10^-12 2pi times 6.18 times 10^-3 E = 9864.795 N/C. direction is outward. (b) E = (3.39 - 7.94) 10^-9/8.85 times 10^-12 times 2pi times 17.5 times 10^-3 E = -4675.73 N/C.