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Skin Effect MCQs

Practice Skin Effect MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Electromagnetic TheorySkin Effect

Skin effect causes high-frequency current in a good conductor to concentrate mainly?

  • ANear the conductor surface
  • BUniformly throughout the entire cross-section
  • COnly at the conductor axis
  • DOutside the conductor with zero internal current
Report an error
Correct Answer: A. Near the conductor surface
Explanation: At higher frequency, electromagnetic diffusion causes current density to become concentrated near the surface.
Reference: Standard electromagnetic theory: skin effect
Question 2
Electromagnetic TheorySkin Effect

For a good conductor, skin depth decreases when frequency?

  • AIncreases
  • BDecreases
  • CBecomes zero only
  • DHas no effect
Report an error
Correct Answer: A. Increases
Explanation: For a good conductor, δ≈sqrt(2/(omega mu sigma)), so increasing frequency decreases skin depth.
Reference: Standard electromagnetic theory: skin effect
Question 3
Electromagnetic TheorySkin Effect

For a good conductor, the skin depth is approximately?

  • Asqrt(2/(omega mu sigma))
  • Bsqrt(omega mu sigma/2)
  • Comega mu sigma
  • D2 omega/(mu sigma)
Report an error
Correct Answer: A. sqrt(2/(omega mu sigma))
Explanation: The standard good-conductor approximation is δ=sqrt(2/(ωμσ)).
Reference: Standard electromagnetic theory: skin effect