AdvancedA-001-002-001
What is the result of skin effect?
B
Answer
Advanced theory and components
Type
A
Thermal effects on the surface of the conductor decrease impedance
B
As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
C
Thermal effects on the surface of the conductor increase impedance
D
As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface
Answer Notes
The "skin effect" is an electrical phenomenon where alternating current (AC) tends to distribute itself within a conductor so that the current density is largest near the surface. As the frequency of the AC increases, this effect becomes more pronounced, causing the current to flow in an increasingly thinner layer at the outer edges of the conductor.
This happens because the alternating current creates a changing magnetic field, which in turn induces opposing eddy currents within the center of the wire, pushing the main current outward. Distractors mentioning decreasing frequency or thermal effects are incorrect because the phenomenon is directly driven by increasing frequency and magnetic fields, not temperature changes.
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What effect causes most of an RF current to flow along the surface of a conductor?