Deep Dive: E3A05
The correct answer is C: They are at right angles. How are the component fields of an electromagnetic wave oriented is that they are at right angles. The electric field and magnetic field are perpendicular to each other. For amateur radio operators, this is fundamental electromagnetic theory. Understanding this helps when working with antennas and propagation.
Why Other Answers Are Wrong
Option A: Incorrect. Fields aren't parallel - they're perpendicular (at right angles). Parallel is wrong. Option B: Incorrect. Tangential isn't the orientation - fields are at right angles. Tangential is wrong. Option D: Incorrect. 90 degrees out of phase refers to time phase, not spatial orientation - fields are at right angles spatially. Phase isn't orientation.
Exam Tip
EM wave field orientation = at right angles. Think 'E'lectric and 'M'agnetic fields = 'E'ach 'M'akes 'R'ight angle. The electric field and magnetic field are perpendicular to each other. Not parallel, not tangential, not 90° phase - just at right angles.
Memory Aid
EM wave field orientation = at right angles. Think 'E'lectric and 'M'agnetic = 'R'ight angles. The electric field and magnetic field are perpendicular to each other. Fundamental electromagnetic theory.
Real-World Example
The component fields of an electromagnetic wave: The electric field (E) and magnetic field (H) are oriented at right angles (90 degrees) to each other. This is fundamental electromagnetic theory - the two fields are always perpendicular. This is the orientation - at right angles.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E3A
Reference: 2024-2028 Question Pool · E3 - Radio Wave Propagation
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E3A topic.