A capacitor is a perfect insulator for

Alternating currents

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Direct currents

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Both ac and dc

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None of these

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Solution

The correct option is B Direct currents
$X_{C} = \frac{1}{ω C} = \frac{1}{2 π v C}$ ; For dc v = 0, $∴ X_{C} = \infty$

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A capacitor is a perfect insulator for

The correct option is B Direct currentsXC=1ωC=12πvC; For dc v = 0, ∴XC=∞

The correct option is B Direct currents
$X_{C} = \frac{1}{ω C} = \frac{1}{2 π v C}$ ; For dc v = 0, $∴ X_{C} = \infty$