Advanced Qualification · A-001 Advanced theory · A-001-002-002
What effect causes most of an RF current to flow along the surface of a conductor?
- A Layer effect
- B Skin effect
- C Piezoelectric effect
- D Resonance effect
Correct answer: B — Skin effect. From the official ISED question bank, verified word for word.
Why
At high radio frequencies, electrical current tends to crowd near the outer edge of a wire rather than flowing through its entire cross-section, a phenomenon known as the skin effect. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.