At a higher frequency of the alternating current, the capacitive reactance Xc
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remains the same
- D. Increases only when the voltage increases
Explanation
Capacitive reactance is given by the formula Xc = 1 / (2πfC). This shows that reactance is inversely proportional to the frequency (f). Therefore, as the frequency of the AC signal increases, the capacitive reactance decreases.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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