. Give Reasons
(i) When a comb rubbed with dry hair attracts pieces of paper.
(ii) Ordinary rubber is an insulator. But the special rubber tyres of
aircrafts are made slightly conducting. Why is this necessary?
(iii) vehicles carrying inflammable materials have metallic ropes
touching the ground during motion. why?
Answers
ii
Explanation:
Ordinary rubber is an insulator. But the special rubber tyres of aircrafts are made slightly conducting. This is because during landing or takeoff, the tyres of aircrafts get charged due to friction between tyres and fround. In case, the tyres are slightly conducting, the charges developed on the tyres will not stay on them and find its way to earth.
Answer:
(a) A comb run through one’s dry hair attracts small bits of paper. Why?
What happens if the hair is wet or if it is a rainy day? (Remember, a paper does not conduct electricity.)
(b) Ordinary rubber is an insulator. But special rubber tyres of aircraft are made slightly conducting. Why is this necessary? (c) Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion. Why?
(d) A bird perches on a bare high power line, and nothing happens to the bird. A man standing on the ground touches the same line and gets a fatal shock. Why?
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