Question

Calculate the electric field due to a surface charge of 20 units on a plate in air(in 10^12 order) (a) 2.19 (b) 1.12 (c) 9.21 (d) 2.91 The question was posed to me during an online exam. This interesting question is from Method of Images topic in section Electrostatic Boundary Value Problem of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

Right choice is (b) 1.12 For explanation I would say: The electric field due to plate of charge will be E = ρs/2εo. Put ρs = 20, we get E = 20/(2 x 8.854 x 10^-12) = 1.129 x 10^12 units.