Vehicles carrying inflammable materials can build up static electric charge due to the friction between the vehicle's tyres and the road, the movement of the liquid/gas within the tank, or friction with air. This static charge can accumulate on the vehicle body. The metallic rope touching the ground provides a path for this charge to be safely conducted away into the earth, preventing the build-up of static electricity and eliminating the risk of a spark that could ignite the inflammable material.
Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion in order to
Asked in UPSC CAPF 2011 · Topic: Conductivity (Electrical Conductivity and Resistivity: Definitions, Units, and Ohm's Law)
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