Question

A wire stretched so that length is doubled what is the effect on its resistivity and why ?

Answer 1

Explanation:

as a wire gets longer its resistance increases, and as it gets thinner its resistance also increases because its cross sectional area decreases. Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length

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Answer 2

Answer:r= roh length/ area

Try this relationship