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A capacitor of capacitance 25μF is connected to an a.c. power source of frequency 200...

Physics
WAEC 1995

A capacitor of capacitance 25μF is connected to an a.c. power source of frequency 200 Hz. Calculate the reactance of the capacitor

  • A. 0.01
  • B. 0.02
  • C. 50.00
  • D. 100.00
  • E. 200.00.
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Correct Answer: Option D
Explanation

To calculate the reactance of a capacitor, we use the formula:

\(X_C = \frac{1}{2 \pi f C}\)

Given: C = 25\(\mu\)F = 25 \(\times 10^{-6}\), F = 200 Hz

Substituting the values into the formula, we approximate \( \pi \) as 10:

\(X_C = \frac{1}{2 \times 10 \times 200 \times (25 \times 10^{-6})}\)

Calculating this: \(X_C = \frac{1}{2 \times 10 \times 200 \times 25 \times 10^{-6}} = \frac{1}{0.01} = 100 \Omega\)

Thus, the capacitive reactance is: 100\( \Omega\)


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