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A tungsten wire, 0.5mm in diameter, is j...

A tungsten wire, `0.5mm` in diameter, is just strechted between two fixed points at a temperture of `40^(@)C`. Determine the tension in the wire when the temperature falls to `20^(@)C`. (coefficant of linear expansion of tungsten `= 4.5xx10^(-6)//.^(0)C,` Young's modulus of tungsten `= 3.4xx10^(10) Nm^(-2))`

A

`0.609N`

B

`3.097N`

C

`5.097N`

D

`7.094N`

Text Solution

Verified by Experts

The correct Answer is:
A
`T = Y alpha Delta theta pi r^(2)`
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