Advanced Qualification · A-001 Advanced theory · A-001-002-003
Where does almost all RF current flow in a conductor?
- A In the centre of the conductor
- B Along the surface of the conductor
- C In a magnetic field in the centre of the conductor
- D In a magnetic field around the conductor
Correct answer: B — Along the surface of the conductor. From the official ISED question bank, verified word for word.
Why
At radio frequencies, electrical current tends to crowd near the outside edge of a wire rather than flowing through its middle. 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.