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The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure : 3 4 6 8 0 t(s) 2 3 4 5 6 When is the value of current at t = 4 s ?

1. zero
2. 1.5 μ A
3. 2 μ A
4. 3 μ A

Correct answer: zero

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