General exam question G5A06
Subelement G5, ELECTRICAL PRINCIPLES· Group G5A
G5A06
How does a capacitor react to AC?
- A.As the frequency of the applied AC increases, the reactance decreases (correct answer)
- B.As the frequency of the applied AC increases, the reactance increases
- C.As the amplitude of the applied AC increases, the reactance increases
- D.As the amplitude of the applied AC increases, the reactance decreases
WhyA capacitor's reactance decreases as the frequency of the applied AC increases. A capacitor's reactance is inversely proportional to frequency (X_C = 1/(2πfC)), so as the applied AC's frequency rises, capacitive reactance falls, answer A. Reactance rises with frequency in an inductor, not a capacitor, which rules out B, and reactance in either component doesn't depend on the signal's amplitude, which rules out C and D.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- G5A01What happens when inductive and capacitive reactance are equal in a series LC circuit?
- G5A02What is reactance?
- G5A03Which of the following is opposition to the flow of alternating current in an inductor?
- G5A04Which of the following is opposition to the flow of alternating current in a capacitor?
- G5A05How does an inductor react to AC?