The vehicles carrying inflammable fluids usually have metallic chains touching the ground :

The vehicles carrying inflammable fluids usually have metallic chains touching the ground :
  1. To protect tyres from catching dirt from ground
  2. To alert other vehicles
  3. It is a custom
  4. To conduct excess charge due to air friction to ground and prevent sparking

Solution

Static charge is developed due to air friction. This can result in combustion. So, metallic chains is used to discharge excess charge.

Asked in: JEE Main 2024 (05 Apr Shift 2)

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