What is the reactance of a 10 μF capacitor on a 50 Hz supply?
Correct answer A. 318 Ω
Explanation
X_C = 1/(2πfC) = 1 ÷ (2π × 50 × 10 × 10⁻⁶) = 318 Ω. Leaving out 2π gives 2000 Ω; multiplying instead of dividing gives 3.14 × 10⁻³ Ω.
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