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The length of a metal wire is l(1) when ...

The length of a metal wire is `l_(1)` when the tension in it is `T_(1)` and is `l_(2)` when the tension is `T_(2)`. The natural length of the wire is:

Text Solution

Verified by Experts

`"From length expansion equation "(DeltaL)/(L)=alpha_(L)DeltaT`
`"From Area expansion equation, "((DeltaV)/(V_(o)))=alpha_(A)DeltaT`
But `alpha_(A)=2alpha_(L)`, therefore, `(DeltaA)/(A_(o))=2alpha_(A)DeltaT=2(DeltaL)/(L)`
Percentage change `=(DeltaA)/(A_(o))xx100=2((DeltaL)/(L)xx100)=2xx1`
Percentage change `=2%`
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Knowledge Check

  • The length of an iron wire is L and area of cross-section is A. The increase in length is l on applying the force F on its two ends. Which of the statement is correct?

    A
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    B
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    C
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    D
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  • A resistance of a metal wire of length AB is 2Omega . Another wire of length PQ of te same metal with twice the diameter of the wire AB is found to hage the same resistance of 2Omega . What is the length of PQ?

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    C
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    D
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