ISRO Electrical Engineering (EE) 2017 - Question 26

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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

Answer: C. Wavelength

Explanation: Skin depth (depth of penetration) δ = 1/√(πfμσ). Since f = c/λ, δ ∝ 1/√f ∝ √λ, so depth of penetration increases with wavelength (lower frequency).

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