An electrostatic precipitator needs to be designed to eliminate 97.5% of the particles in a gas stream that flows at 3500 m3/min. The particles that need to be removed have a drift velocity of 5.0 cm/s. The design requires 2 mechanical fields of plates with dimensions of 7 m by 12 m. a. What is the required plate area in m2? b. What is the actual plate area in m2? c. How many plates are necessary?