Practice portal › Alternating Current › AC Through R, L and C
Asked in GUJCET 2018 · Behaviour of R, L and C separately
Idea: capacitive reactance is X_C = 1/(ω C) = 1/(2π fC).
For a d.c. source the frequency is f = 0.
As f → 0, X_C = 1/(2π fC) → ∞.
Physically: after a brief charging current, no steady current flows through a capacitor on d.c.; it blocks d.c. completely, so its reactance is infinite.
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