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JAMB Physics 2008 Question 38

Question 38

Electrostatics

A short chain is sometimes attached to the back of a petrol tanker to

  1. A.generate more friction.
  2. B.ensure the balancing of the tanker.
  3. C.caution the driver when overspeeding.
  4. D.conduct excess charges to the earth.
Show the answer and explanation

Answer: D (conduct excess charges to the earth.)

Explanation

Friction with the air charges the tanker. The metal chain touching the road conducts the charge to earth so a spark cannot ignite the petrol.