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The figure shows a half-wave rectifier with a $475 \: \mu F$ filter capacitor. The load draws a constant current $I_{o}= 1 \: A$ from the rectifier. The figure also shows the input voltage $V_{i}$, the output voltage $V_{C}$ and the peak-to-peak voltage ripple $u$ on $V_{C}$. The input voltage $V_{i}$ is a triangle-wave with an amplitude of $10 \: V$ and a period of $1 \: ms$.

The value of the ripple $u$ (in volts) is _________