Deep Dive: T3B03
The correct answer is C: Electric and magnetic fields. A radio wave consists of two components: an electric field and a magnetic field. These two fields are coupled together and propagate through space, creating the electromagnetic wave. The electric field and magnetic field are the two fundamental components of all electromagnetic waves, including radio waves. They oscillate together, with the changing electric field creating the magnetic field, and the changing magnetic field creating the electric field. This self-sustaining relationship allows the wave to propagate through space. Both fields are necessary - you cannot have an electromagnetic wave with only one field.
Why Other Answers Are Wrong
Option A: Incorrect. Impedance and reactance are circuit properties, not components of a radio wave. They describe how circuits respond to AC signals. Option B: Incorrect. Voltage and current are electrical circuit quantities, not the components of the radio wave itself. The wave consists of fields, not voltage and current. Option D: Incorrect. Ionizing and non-ionizing are categories of radiation, not components of a wave. Radio waves are non-ionizing.
Exam Tip
Radio wave components = Electric and magnetic fields. Remember: A radio wave has two components - an electric field and a magnetic field. These oscillate together to form the electromagnetic wave.
Memory Aid
**R**adio **W**ave = **E**lectric + **M**agnetic (think 'RW = EM' = Electric + Magnetic)
Real-World Example
When you transmit a radio signal, you're creating an electromagnetic wave that consists of an electric field and a magnetic field. These fields oscillate together as the wave travels through space. At your receiver, these fields induce currents in the antenna, which are then converted back into electrical signals. Both the electric and magnetic fields are essential parts of the radio wave.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T3B
Reference: FCC Part 97.3
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T3B topic.