Question
When an electrical component $X$ is joined with any ac circuit, then current in it is ahead of phase of voltage by $\frac{\pi}{2}$ radian. Identify X and write an expression for its reactance.
✓
Answer
Component X is a capacitor and its reactance
$ =\frac{1}{\omega C}=\frac{1}{2 \pi / C}
$
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