Complex dielectric constant of earth is given by ____(a) \(ϵ’=ϵ+\frac{σ}{jw} \)(b) \(ϵ’=σϵ+\frac{1}{jw} \)(c) \(ϵ’=σ+\frac{ϵ}{jw} \)(d) \(ϵ’=ϵ+\frac{σϵ}{jw} \)This question was addressed to me in a national level competition.I'm obligated to ask this question of Radio Wave Propagation in division Radio Wave Propagation of Antennas

Complex dielectric constant of earth is given by ____(a) \(ϵ’=ϵ+\f

1.	Complex dielectric constant of earth is given by ____(a) \(ϵ’=ϵ+\frac{σ}{jw} \)(b) \(ϵ’=σϵ+\frac{1}{jw} \)(c) \(ϵ’=σ+\frac{ϵ}{jw} \)(d) \(ϵ’=ϵ+\frac{σϵ}{jw} \)This question was addressed to me in a national level competition.I'm obligated to ask this question of Radio Wave Propagation in division Radio Wave Propagation of Antennas
Answer» Correct CHOICE is (a) \(ϵ’=ϵ+\frac{σ}{jw} \) The EXPLANATION is: The earth is neither a GOOD conductor nor a good DIELECTRIC. So the dielectric constant of earth is complex and is given by\(ϵ’=ϵ+\frac{σ}{jw} \)where σ is the conductivity and W is angular frequency.

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