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Old Dec 10th 2014, 11:21 PM   #1
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attenuation of electromagnetic wave in metal problem

The conductivity of a metal is 3.210^7 (Ωm)^-1 .Find the attenuation of an electromagnetic wave of frequency 2khz by a metal plate of thickness 0.1mm.
I found the skin depth using δ=(2/μωσ)^(1/2) = 1.98910^-3 m
Then 1/α= δ .so α = 502.65 m^-1 is the attenuation coefficient.
But the answer given in the book is different.
It is: E (transmitted)/E (incident)=0.95.
Somebody help me understand the book answer.How is the author arriving at such a solution? Please refer me to few worked out examples on this topic if you can.
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