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

` alpha_(1) + alpha_(2)`

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

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

`alpha_(1)-alpha_(2)`

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