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A uniform iron wire of cross-section are...

A uniform iron wire of cross-section area 0.20 `xx` `10^-6` `m^2` is held fixed in between fixed supports. If wire cooled from `100°C` to `O°C`, then force of 48 N is exerted on supports by ends, then expansion coefficient of wire Young's modulus of steel `=2xx10^(11)N//m^(2)`

A

0.6 `xx` `10^-5`/°C

B

0.3 `xx` `10^-5`/°C

C

1.2 `xx` `10^-5`/°C

D

2.4 `xx` `10^-5`/°C

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A uniform steel wire of cross-sectional area 0.20mm^(2) is held fixed by clamping its two ends. If wire is cooled from 100^(@)C to 0^(@)C , find (a) temperature strain (b) temperature stress (c) extra force exerted by each clamp on the wire. Young's modulus of steel =2xx10^(11)N//m^(2) , coefficient of linear expansion of steel =1.2xx10^(-5)//^(@)C .

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