$4-$ In an electrostatic precipitator $($ESP$)$ system, dielectric constant is $6$ and local field strength is

$350k\frac{V}{m}.$ Collecting area to flowrate ratio is found to be $10\frac{s}{m}.$ Calculate the individual and

overall efficiency of the ESP $($in $\%)$ for the particle data given in Table $2$ below by using the

mixed$-$flow equation $({}_0=8\mathrm{.}85{10}^{-12}\frac{C}{v}*m$ and $\{$:$$:$1\mathrm{.}8{10}^{-5}\frac{kg}{m}s).$

Table $2.$ PM data for ESP.