Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) The coefficient of linear expansion of metal body in one direction is `alpha_1` and that in every direction perpendicular to it `alpha_2`. The coefficient of cubical expansion is - Sarthaks eConnect

The coefficient of linear expansion of metal body in one direction is `alpha_1` and that in every direction perpendicular to it `alpha_2`. The coefficient of cubical expansion is:

`alpha_1 + alpha_2`

`2alpha_1 + alpha_2`

`alpha_1 +2 alpha_2`

`2(alpha_1 + alpha_2)`