The value of capacitive reactance is given by:
Correct answer: D. Xc=1/2πfC
- A. Xc=VI
- B. Xc=V/I
- C. Xc=I/V
- D. Xc=1/2πfC
Explanation
The correct option represents the capacitive reactance, which is the opposition to the flow of alternating current in a circuit due to a capacitor. It depends on the frequency of the AC signal (f) and the capacitance (C) of the capacitor.
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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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