alleryFor RC circuit charging through resistor R: dq/dt + q/(RC) = V/R. Time constant:
ARC (= τ)
BC/R
CR + C
DR/C
Answer & Solution
Correct answer: A. RC (= τ)
τ = RC.
**Charge:** q(t) = CV(1 - e^(-t/τ)).
**After one time constant:** q ≈ 63% of final.
Practical 'fully charged' after ~5τ.
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