Question

A meter rod made of steel is correct at 0c and another meter rod of the same material is correct at 30 C. If alpha=12×10
−6
/C, the difference between their lengths at 20C is?​

Answer 1

difference between  in length= 36x10^-5 m

Explanation:

this means the length of one of the rod at zero degree celsius is equal to the length of the other rod at 30 degree Celsius. as a result in the first rod there is an increase in temperature by 20 degree Celsius and in the second brought there is a decrease in temperature by 10 degree Celsius

In the first rod,

dl1= 12x10^-6 x20 X1= 24x10^ -5

In the second rod ,

dl1 = 12x 10^ -6x 10x1=- 12x10^ -5

hence the difference between the two the lord is actually the sum of the difference in length= 36x10^-5 m

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