"\\frac{dV(t)}{dt}=V(t)" then "\\ln" |"V"|"=t+\\ln C" then "V=Ce^t" . As "V(0)=V_0=C," then
"V(t)=V_0e^t" hence "V(\\tau)=2V_0=V_0e^\\tau" hence "e^\\tau=2," hence "\\tau=\nln 2\\approx0.69 s"
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