Calculate the required field strength (in kV/m) of an ESP which operates at 10,000 m³/min flowrate, has total collection area of 5,000 m², and provides a collection efficiency of 95% for 5 m particles (Use mixed flow model, ₀ = 8.85x10^-12 C/V.m, = 6, _air = 1.8x10^-5 kg/m.s).