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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

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

C

`sqrt(alpha_(1)alpha_(2))`

D

`alpha_(1)-alpha_(2)`

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