Deep Dive: E5B05
The correct answer is D: It is replaced by its reciprocal. What is the effect on the magnitude of pure reactance when it is converted to susceptance is that it is replaced by its reciprocal. Susceptance B = 1/X, so the magnitude becomes the reciprocal. For amateur radio operators, this is important for circuit theory. Understanding this helps when converting between reactance and susceptance.
Why Other Answers Are Wrong
Option A: Incorrect. It is unchanged isn't correct - reactance magnitude is replaced by its reciprocal. Unchanged is wrong. Option B: Incorrect. The sign is reversed isn't the effect - the magnitude is replaced by its reciprocal. Sign reversal isn't the effect. Option C: Incorrect. It is shifted by 90 degrees isn't the effect - the magnitude is replaced by its reciprocal. 90° shift isn't the effect.
Exam Tip
Pure reactance to susceptance = magnitude replaced by its reciprocal. Think 'R'eactance to 'S'usceptance = 'R'eciprocal. Susceptance B = 1/X, so magnitude becomes reciprocal. Not unchanged, not sign reversed, not 90° shift - just replaced by reciprocal.
Memory Aid
Pure reactance to susceptance = magnitude replaced by its reciprocal. Think 'R'eactance to 'S'usceptance = 'R'eciprocal. Susceptance B = 1/X, so magnitude becomes reciprocal. Important for circuit theory.
Real-World Example
Converting pure reactance to susceptance: The effect on the magnitude is that it is replaced by its reciprocal. For example, if X = 100 ohms, then B = 1/100 = 0.01 siemens. The magnitude becomes the reciprocal. This is the effect - replaced by its reciprocal.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E5B
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 E5B topic.