First slide

AC Circuits

Question

A capacitor is a perfect insulator for

Moderate

A

Alternating currents
B

Direct currents
C

Both ac and dc
D

None of these

Solution

$X_{C} = \frac{1}{ωC} = \frac{1}{2 πν C}$ ; For dc $ν = 0, ∴ X_{C} = \infty$

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