Question

Petrol tankers along the highways often have metal chains attached that drag along the road.
Explain the reason for this ?

Answer 1

Movement of vehicle on road produces electric charges and hence sparking due to rubbing of tyres on road which is very dangerous since petrol is very inflammable. Metal chains that drag along the road helps in absorbing these dangerous electric charges produced by vehicle's tyres.



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Answer 2

Answer:

Because, metallic bodies of cars , trucks or any other big vehicles gets charged because of friction between them and the air rushing past them. ... That is why tankers often have a metal chain dragging along the ground so that charge produced leaks to the ground through chain.xplanation: