Deep Dive: E5A06
The correct answer is B: It is at a maximum. What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance is that it is at a maximum. At parallel resonance, circulating current is maximum. For amateur radio operators, this is important for circuit theory. Understanding this helps when working with resonant circuits.
Why Other Answers Are Wrong
Option A: Incorrect. It is at a minimum isn't correct - at parallel resonance, circulating current is maximum. Minimum is wrong. Option C: Incorrect. It equals 1/(2π√(LC)) isn't the answer - circulating current is at maximum. Formula isn't the answer. Option D: Incorrect. It equals 2π√(LC) isn't the answer - circulating current is at maximum. Formula isn't the answer.
Exam Tip
Parallel LC circulating current at resonance = at a maximum. Think 'P'arallel 'L'C at 'R'esonance = 'M'aximum 'C'irculating current. At parallel resonance, circulating current is maximum. Not minimum, not formulas - just maximum.
Memory Aid
Parallel LC circulating current at resonance = at a maximum. Think 'P'arallel 'L'C = 'M'aximum current. At parallel resonance, circulating current is maximum. Important for circuit theory.
Real-World Example
A parallel LC circuit at resonance: The magnitude of the circulating current within the components (between L and C) is at a maximum. This is because at resonance, the LC tank has maximum energy storage and circulation. This is the magnitude - at a maximum.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E5A
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 E5A topic.