MDCAT Physics MCQ #74

Why does increasing the frequency of AC in a capacitor increase its reactance?

MDCAT Physics MCQ #74

  1. Question 1

    Q1. Why does increasing the frequency of AC in a capacitor increase its reactance?

    • A) Higher frequency reduces the time to charge the plates.
    • B) Dielectric material becomes more conductive at high frequencies.
    • C) Capacitors pass DC but block AC.
    • D) Plate area decreases with frequency.

    Answer: Higher frequency reduces the time to charge the plates.

    Explanation: X_C = 1/(2πfC); higher f reduces current. C is incorrect because capacitors block DC.