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B
glass
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C
ebonite
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D
ebonite covered with fur
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Solution
The correct option is A
copper
(A): copper
A lightning conductor consists of long, thick metal rod/strip having sharp spikes at its upper end.
The spikes pointing towards the sky are fixed at the highest point of the building.
The lower end of the metal rod/strip is connected to a large copper (or aluminum) plate which is buried deep inside the Earth. This is called earthing.
Generally, copper and its alloy are most commonly used in lightning protection.
Hence, the correct answer is an option (A): copper.