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Find the flux density of line charge of radius (cylinder is the Gaussian surface) 2m and charge density is 3.14 units?(a) 1(b) 0.75(c) 0.5(d) 0.25I have been asked this question in a job interview.My doubt is from Electric Field Density in portion Electrostatic Fields of Electromagnetic Theory

Answer»

Correct answer is (d) 0.25

For explanation: The electric FIELD of a line charge is given by, E = λ/(2περ), where ρ is the radius of cylinder, which is the Gaussian surface and λ is the charge DENSITY. The density D = εE = λ/(2πρ) = 3.14/(2π X 2) = 1/4 = 0.25.



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