College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 16 - Conceptual Questions - Page 611: 12


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Work Step by Step

They do this to make sure no excess charge builds up on the gas-filled containers. If there were no way for excess charges to move off the truck (and into the ground which is neutral) then the charge could potentially build up (from friction or charged air moving over it) and cause a spark. This could potentially cause the gas to explode.
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