A wire-plate electrostatic precipitator (ESP), designed for a commercial application for removing atmospheric particles, operates steadily with a flow rate equal to 1500 m3/h. The ESP is made up of 17 plates, each (1m x 1.5 m) with 10 cm spacing between the plates. The corona wires are charged at 24.0 kV, and the maximum electrical field is 450,000 V/m. estimate the ESP efficiency, assuming that the average electrical drift velocity is equal to 2.91 cm/s.