Step 1:**
Integrate the given current equation with respect to time:
\[ \int i \, dt = \int \left( \frac{E}{R} \right) e^{-t/RC} \, dt \]
\[ \int i \, dt = \frac{E}{R} \int e^{-t/RC} \, dt \]
\[ \int i \, dt = \frac{E}{R} \left( -RC e^{-t/RC} \right) + C_1 \]
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