A $98\%$ efficient ESP is to treat a gas stream flowing at $5000\frac{m^3}{m}in.$ If the effective drift

velocity is $6\mathrm{.}0c\frac{m}{s},$ calculate $($a$)$ the plate area $($required and actual$)$ in $m^2,$ and $($b$)$ the

number of plates if each plate is $6m$ by $10m,$ and there are $3$ mechanical fields.