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Electrostatic precipitators: Electrostatic precipitators are devices used to remove particles, such…
Electrostatic precipitators: Electrostatic precipitators are devices used to remove particles, such as dust and ash, from a flowing gas using the force of an induced electrostatic charge. It consists of two sets of electrodes: positive and negative. The negative electrodes are in the form of a wire mesh, and the positive electrodes are plates. These electrodes are vertically placed and alternate to each other. High Direct Current (DC) voltage is fed to the discharge electrodes, generating a negative electric field around them. The gas-borne particles such as ash are ionised by the corona effect. When the polluted gas passes through the electric field, the particles become charged and are attracted to oppositely charged collector plates, where they adhere until they are removed.
Answer the following questions:
(a)
Name any two electrostatic processes involved in the working of an electrostatic precipitator.
(b)
If the medium between the mesh and the plates is filled with a dielectric medium of dielectric constant K = 10, what will happen to the efficiency of working of the device?
(c)
What is the strength of the electric field between two parallel conducting plates separated by 2 cm and having a potential difference (voltage) between them of $1.50 \times 10^4\text{ V}$?
(d)
Name any other device used in day-to-day life, based on the principle of the electrostatic precipitator.
Answer
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From ISC 2025 Practice Physics, question 91.