Correct option is D
The correct answer is (d) Hollow GI rod; a hollow galvanized iron (GI) rod is used for pipe earthing.
Explanation: In pipe earthing, a galvanized iron pipe is vertically buried in the ground, acting as the earth electrode, and the "hollow" aspect refers to the fact that the pipe is not solid but has a cavity inside.
points about pipe earthing:
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Material: Galvanized iron (GI)
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Shape: Hollow pipe
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Function: Provides a good electrical connection to the earth by being buried in the soil.
The following methods of earthing is given below-
· Strip earthing
· Plate earthing
· Pipe earthing
· Rod earthing
· Coil earthing
