Answer
$i=8.0A$
Work Step by Step
Let the area of each circular plate be $A$ and that of the central circular section be $a$. Then
$$
\frac{A}{a}=\frac{\pi R^2}{\pi(R / 2)^2}\\=4 .
$$
Now, from Formula the total discharge current is given by $i=i_d=4(2.0 \mathrm{~A})$ $=8.0 \mathrm{~A}$.
