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A steel wire of unifrom cross-section 1 ...

A steel wire of unifrom cross-section `1 mm^(2)` is heated to `70^(@)C` and strechted by tying it two ends rigidly. Calculate the change in tension on the wire when temperature falls form `70^(@)C` to `35^(@)C`

A

`70N`

B

`72N`

C

`74N`

D

`77N`

Text Solution

Verified by Experts

The correct Answer is:
D
`F = YA* Delta t`
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