Answer
$C = 0.5 µF$
Work Step by Step
Use the capacitor equation $C*\frac{dv}{dt} = i$
Use the graphs to find i and $\frac{dv}{dt} $
$i = 1.5 mA$
$\frac{dv}{dt} = 15/(5*10^{-3})= 3000 V/s$
$C = 0.0015/3000 = 0.5µF$
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