Identify A, B, C, and D in the depicted diagram and select the correct option

Difficult

A

A B C D
Negatively charged wire Dust particles Discharge corona Collection plate
B

A B C D
Negatively charged wire Discharge corona Collection plate Dust particles
C

A B C D
Positively charged wire Dust particles Discharge corona Collection plate
D

A B C D
Positively charged wire Discharge corona Collection plate Dust particles

Solution

The given diagram is an electrostatic precipitator that can remove over 99 percent particulate matter present in the exhaust from a thermal power plant. There are electrode wires and a stage of collecting plates, The collecting plates are connected with the ground. The electrode wire is provided with several thousand volts of electric current. It creates a corona that releases electrons. The electrons attach to the suspended particles and make them negatively charged within a fraction of a second. Air with charged particles passes slowly over collecting plates. The particulate matter settles over them and is removed.

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A	B	C	D
Negatively charged wire	Dust particles	Discharge corona	Collection plate

A	B	C	D
Positively charged wire	Dust particles	Discharge corona	Collection plate