A metallic rod l cm long, A square cm in...

A metallic rod l cm long, A square cm in cross-section is heated through `t^(@)"C"`. If Young’s modulus of elasticity of the metal is E and the mean coefficient of linear expansion is `alpha` per degree celsius, then the compressional force required to prevent the rod from expanding along its length is

`EAalphat`

`EAalphat//(1+alphat)`

`EAalphat//(1-alphat)`

`Elalphat`

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