Smoke precipitators like the one in the image are used to remove particles from the air. How are electric fields applied in the successful use of a precipitator?

Question

A. Smoke particles are big, so they get filtered by the charged plates in the percipitator.
B. Smoke particles are heavy, so they precipitate quikly to the hopper in the precipitator.
C. Smoke particles are naturally charged, so they are attrached to the plates in the percipitators.
D. Smoke particles get charged by the precipitator, so they are then attracted to its charged plates.

Answer 1

D. Smoke particles get charged by the precipitator, so they are then attracted to its charged plates.