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The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure.
What is the value of current at $t = 4$ s?
(1) Zero
(2) $3,\mu$A
(3) $2,\mu$A
(4) $1.5,\mu$A
From graph, $I = \frac{dq}{dt}$. At $t = 4$ s, $q$ is constant (flat portion of graph), so $I = 0$.
BETA
