Advanced Qualification · A-001 Advanced theory · A-001-002-007
A wire has a current passing through it. Surrounding this wire there is:
- A a skin effect that diminishes with distance
- B an electromagnetic field
- C an electrostatic field
- D a cloud of electrons
Correct answer: B — an electromagnetic field. From the official ISED question bank, verified word for word.
Why
When electric current flows through a wire, it creates an invisible region of force around it called an electromagnetic field. 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.