Question

Inorder to elongate a wire to double its length, one requires a stress which is

Answer 1

Answer:

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Answer 2

Answer:

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Explanation:

• Longitudinal Strain is ratio of change in length to original length. Wire is stretched to double it's original length. Hence change in length = 2×L - L (where L is original length. ) Therefore change in length is L.
• R′=ρA2L. So, R = 2R'. Hence, If the length of a wire is doubled, then its resistance becomes 2 times.
• So, now if you increase the length of wire by 2 times it's cross-sectional area will decrease by 2 times, because the volume of the wire has to remain constant. ... Originally Answered: A wire is stretched double its length.
• 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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