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Vikas TU Grade: 12th Pass
        copper wire of length 150 cm is heated from 30°C to 130°C. If its length gets increased by 2.55 mm,

the coefficient of linear expansion of copper is
6 years ago

Answers : (2)

Sudheesh Singanamalla
114 Points
										

Length of copper wire = 150 cm = 1500 mm


Temperature initial (Ti) = 30


Temperature Final (Tf) = 130


change in temperature = 130 - 30 = 100


change in  length = 2.55 mm


change in length / actual length = coefficient of linear expannsion * Change in temperature.


2.55/(1500 * 100 ) = coefficient of linear expansion.


coefficient of linear expansion. = 0.000017 = 1.7 * 10 ^ -5


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Please approve !!


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6 years ago
Ritvik Gautam
85 Points
										

We know that the change in length of wire is,


l'=lαT


where l' is the change in length


l is original length


α is the coefficient of linear expansion


and T is the change in temperature.


Substituting the values,


2.55x10-3 = 0.150 x α x 100


Hence, we get


α=1.5x10-4


 


 


Please Approve!!

6 years ago
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