Answer
$\tau =2.52~s$
Work Step by Step
We can find the time constant $\tau$:
$\tau = RC$
$\tau = (1.40~M \Omega)(1.80~\mu F)$
$\tau = (1.40\times 10^6~\Omega)(1.80\times 10^{-6}~F)$
$\tau =2.52~s$
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