Deep Dive: E5C03
The correct answer is C: A positive 90 degree phase angle. Which of the following represents a pure inductive reactance in polar coordinates is a positive 90 degree phase angle. Inductive reactance has +90° phase angle. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with impedance.
Why Other Answers Are Wrong
Option A: Incorrect. Positive 45 degree phase angle isn't pure inductive - pure inductive is +90°. 45° isn't correct. Option B: Incorrect. Negative 45 degree phase angle isn't pure inductive - pure inductive is +90°. -45° isn't correct. Option D: Incorrect. Negative 90 degree phase angle is capacitive, not inductive - inductive is +90°. -90° is capacitive.
Exam Tip
Pure inductive reactance in polar = positive 90 degree phase angle. Think 'I'nductive = '+9'0° phase angle. Inductive reactance has +90° phase angle. Not 45°, not -45°, not -90° (capacitive) - just +90°.
Memory Aid
Pure inductive reactance in polar = positive 90 degree phase angle. Think 'I'nductive = '+9'0°. Inductive reactance has +90° phase angle. Important for circuit theory.
Real-World Example
Pure inductive reactance in polar coordinates: It's represented by a positive 90 degree phase angle. For example, 100∠90° represents 100 ohms of inductive reactance. This is the representation - positive 90° phase angle.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E5C
Reference: 2024-2028 Question Pool · E5 - Electrical Principles
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E5C topic.