The capacitive reactance of the AC circuit increases:
Correct answer: B. By decreasing the frequency of AC
- A. By increasing the frequency of AC
- B. By decreasing the frequency of AC
- C. Does not depend upon the frequency of the AC voltage
- D. None of these
Explanation
Capacitive reactance (Xc) is inversely proportional to the frequency of the AC voltage. As the frequency decreases, the capacitive reactance increases. The relationship is given by the formula: Xc = 1 / 2πfC Where 'f' is the frequency and 'C' is the capacitance.
This question appeared on the ETEA MDCAT 2010 paper, which you can sit online with every answer explained.
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About AC Through Resistor, Capacitor and Inductor
Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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