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Yogita Ingle 6 years, 3 months ago
A new family of carbon allotropes consisting of cluster of carbon atoms such as C32 , C50 , C60 , C70 , C84 etc. are called fullerenes.
Fullerenes are made by heating of graphite in an electric arc in the presence of inert gases such as helium or argon.
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Gaurav Seth 6 years, 3 months ago
Answer:
- Here, length is doubled and area of cross-section is halved. Thus, a wire of length l and area of cross-section A becomes a wire of length 2l and area of cross-section A/2

i.e., resistance becomes four times - Resistivity of a substance does not depend on its length or area of cross-section. It depends on the nature of the material and temperature. Hence there is no change
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Bijoy Mathew 6 years, 3 months ago
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