Multiple choice

In the figure shown, the capacitor is initially uncharged. Which one of the following expressions describes the current I (t) (in mA) for t > 0?

  1. I (t) = $\frac{5}{3}$ (1 – e–t/r), T = $\frac{2}{3}$ m sec
  2. I (t) = $\frac{5}{2}$ (1 – e–t/r), T = $\frac{2}{3}$ m sec
  3. I (t) = $\frac{5}{3}$ (1 – e–t/r), T = 3 m sec
  4. I (t) = $\frac{5}{2}$ (1 – e–t/r), T = 3 m sec
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