(a) Thermal Power plants/smelters/other particulate matter releasing industries. To remove : particulate matter.
(b) Very very small particulate matter/less than 2.5 micrometres are not removed/velocity of air between plates must be low enough to allow the , dust to fall/cannot work without electricity.
Detailed Answer :
(a) In thermal power plants and automobile vehicles. It is because, electrostatic precipitator can remove particulate matter from their exhaust.
(b) One of the major limitations of electrostatic precipitator is that it cannot remove particulates which are 2.5 micrometers or less in diameter, which may cause respiratory symptoms.
