Repeat
Work done by the battery is half of the energy dissipated in the resistor
At t = 2τ, q = CV(1– e–2)
At t = , q = CV(1– e–1)
At t = τ , q = CV/2
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q = q0 (1 – e–t/t)
= CV(1 – e–2τ/τ)