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The depth of penetration of a wave in a lossy dielectric increases with increasing

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The depth of penetration of a wave in a lossy dielectric increases with increasing

(a) Conductivity

(b) Permeability

(c) Wavelength

(d) Permittivity

I have been asked this question in an internship interview.

Query is from Advanced and Tricky Questions in chapter Advanced and Tricky Questions of Electromagnetic Theory

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Correct choice is (c) Wavelength

Easy explanation: The depth of penetration or skin depth is inversely proportional to the frequency. Thus it has to be directly proportional to the wavelength.

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