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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)

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+2 votes
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in Electromagnetic Theory by (188k points)
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

1 Answer

+1 vote
by (652k points)
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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