An electrostatic precipitator has collecting plates 3 m tall 1 m long in the direction of flow. the spacing between the charging electrode and the collecting plate is 7.56 cm. the device is to be used to collect particles having a dielectric constant of 4 and an effective diameter of 4 um. the carrier gas (air at 25 °c) has a velocity of 1.2 m/s. calculate the collection efficiency for a charging voltage of (a) 10 kv, (b) 20kv, (c) 30kv, (d) 40kv and (e) 50kv. omit the cunningham correction