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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) 2.91The 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

Answer»

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.



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