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A short chain is usually attached to the back of a petrol tanker and trailing...

Physics
WAEC 1993

A short chain is usually attached to the back of a petrol tanker and trailing behind it so that the

  • A. petrol tanker is balanced on the road
  • B. heat generated by friction in the engine can be conducted to the earth
  • C. charges generated by friction in the tanker are conducted to the earth
  • D. tanker can move slowly as the chain touches the road surface
  • E. chain can produce sound in resonance with the noise from the tanker‘s engine
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Correct Answer: Option C
Explanation

Big vehicles gets charged because of friction between them and the air rushing past them.This is the reason tankers often have a metal chain dragging along the ground so that charge produced leaks to the ground through chain.

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