Extra exam question E5A06
Subelement E5, ELECTRICAL PRINCIPLES· Group E5A
What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?
- A.It is at a minimum
- B.It is at a maximum (correct answer)
- C.It equals 1 divided by the quantity 2 times pi, times the square root of (inductance L multiplied by capacitance C)
- D.It equals 2 times pi, times the square root of (inductance L multiplied by capacitance C)
WhyThe circulating current within the components of a parallel LC circuit at resonance is at a maximum. At resonance, a parallel LC circuit's internal circulating current, the current flowing back and forth between the inductor and capacitor as they exchange stored energy, reaches its maximum, even though the current drawn from the external source at that same moment is minimal, answer B. It isn't at a minimum, and the two formula-based options describe resonant frequency itself, not circulating current magnitude.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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