Question: In an AC circuit, if the frequency is increased, what happens to the capacitive reactance? (2020)
Options:
It increases
It decreases
It remains constant
It becomes zero
Correct Answer: It decreases
Exam Year: 2020
Solution:
Capacitive reactance XC = 1/(2πfC) decreases as frequency f increases.
In an AC circuit, if the frequency is increased, what happens to the capacitive
Practice Questions
Q1
In an AC circuit, if the frequency is increased, what happens to the capacitive reactance? (2020)
It increases
It decreases
It remains constant
It becomes zero
Questions & Step-by-Step Solutions
In an AC circuit, if the frequency is increased, what happens to the capacitive reactance? (2020)
Step 1: Understand what capacitive reactance (XC) is. It is a measure of how much a capacitor resists the flow of alternating current (AC).
Step 2: Know the formula for capacitive reactance: XC = 1/(2πfC), where 'f' is the frequency and 'C' is the capacitance.
Step 3: Identify that in the formula, 'f' (frequency) is in the denominator. This means that as 'f' increases, the value of XC will change.
Step 4: Realize that if you increase the frequency (f), the overall value of XC will decrease because you are dividing by a larger number.
Step 5: Conclude that increasing the frequency in an AC circuit results in a decrease in capacitive reactance.
Capacitive Reactance – Capacitive reactance (XC) is the opposition that a capacitor offers to the flow of alternating current, which is inversely proportional to the frequency of the AC signal and the capacitance.
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