Question on: WAEC Physics - 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
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Correct Option: C
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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