Q: Perhaps you have seen a gasoline truck trailing a metal chain beneath it. What purpose does the chain serve?
Ans: Yes, there is metal chain beneath a gasoline truck. The tyres of the truck are made up of rubber due to friction with road they gain charges. It is dangerous if they accumulate to large amount because there is fuel in the truck, it may explode. To avoid this situation, charges go back to road by the conducting (metal) chain.
This is the main purpose of metal chain trailing.
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