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The coefficient of linear expansion of a...

The coefficient of linear expansion of an in homogeneous rod change linearly from `alpha_(1)` to `alpha_(2)` from one end to the other end of the rod. The effective coefficient of linear expansion of rod is

A

`alpha_(1) + alpha_(2)`

B

`(1)/(2) (alpha_(1) + alpha_(2) )`

C

`sqrt( alpha_1 + alpha_2)`

D

`alpha_(1) - alpha_(2)`

Text Solution

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The correct Answer is:
B
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