What is the time constant for the discharge of the capacitors in the figure (figure 1)?

What is the time constant for the discharge of the capacitors in the figure (Figure 1) ?

Answer

\begin{aligned}
R_{e q}=\frac{R_{1} R_{2}}{R_{1}+R_{2}}=\frac{|x|}{1+1}=\frac{1}{2} k\Omega=0.5 \mathrm{k\Omega} \\
C=4 \mathrm{\mu f} \\
\end{aligned}

\begin{aligned}
\text { Time constant } \tau=R C=\operatorname{Ref} \times C \\
= & \left(0.5 \times 10^{3} \Omega\right)
\times\left(4 \times 10^{-6} \mathrm{~F}\right) \\
= & (5 \times 4) \times 10^{-4} \mathrm{~s} \\
= & 2 \times 10^{-3} \mathrm{~s} \\
= & 2 \mathrm{~ms}
\end{aligned}