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A steel wire of length 20 cm and uniform...

A steel wire of length 20 cm and uniform cross-section `1mm^(2)` is tied rigidly at both the ends. If the temperature of the wire is altered from `40^(@)C` to `20^(@)C`, the change in tension. [Given coefficient of linear expansion of steel is `1.1xx10^(5) .^(@)C^(-1)` and Young's modulus for steel is `2.0xx10^(11) Nm^(-2)`]

A

`2.2xx10^(6)N`

B

`16N`

C

8N

D

44N

Text Solution

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The correct Answer is:
D
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