A metal bar of length L and area of cros...

A metal bar of length `L` and area of cross-section A is clamped between two rigid supports. For the material of the rod. It Young's modulus is Y and Coefficient if linear expansion is `alpha`. If the temperature of the rod is increased by `Deltat^(@)C`, the force exerted by the rod on the supports is

`YL alpha Delta theta`

`YA alpha Delta theta`

`YL Delta theta`

`YAL alpha`

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