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What is the effect of increasing frequency on the reactance of a capacitor?

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Question: What is the effect of increasing frequency on the reactance of a capacitor?

Options:

  1. Reactance increases
  2. Reactance decreases
  3. Reactance remains constant
  4. Reactance becomes zero

Correct Answer: Reactance decreases

Solution: 

The reactance (Xc) of a capacitor decreases with increasing frequency, calculated as Xc = 1 / (2πfC), where f is the frequency and C is the capacitance.

What is the effect of increasing frequency on the reactance of a capacitor?

Practice Questions

Q1
What is the effect of increasing frequency on the reactance of a capacitor?
  1. Reactance increases
  2. Reactance decreases
  3. Reactance remains constant
  4. Reactance becomes zero

Questions & Step-by-Step Solutions

What is the effect of increasing frequency on the reactance of a capacitor?
Correct Answer: Reactance decreases with increasing frequency.
  • Step 1: Understand what reactance is. Reactance is a measure of how much a capacitor resists the flow of alternating current (AC).
  • Step 2: Know the formula for reactance of a capacitor: Xc = 1 / (2πfC). Here, Xc is the reactance, f is the frequency, and C is the capacitance.
  • Step 3: Identify the relationship between frequency and reactance. In the formula, as frequency (f) increases, the value of Xc decreases.
  • Step 4: Realize that this means that at higher frequencies, the capacitor allows more current to pass through because it resists less.
  • Step 5: Conclude that increasing the frequency of the AC signal results in a decrease in the reactance of the capacitor.
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