The compressional force required to prevent a \( \mathrm{P} \) meta...

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The compressional force required to prevent a
\( \mathrm{P} \) metallic rod of cross-sectional area \( A \) from
\( \mathrm{W} \) expanding, when it is heated to increase its temperature by \( t^{\circ} C \), is (modulus of elasticity is \( E \) and coefficient of linear expansion is \( \alpha \) )
(1) \( E A \alpha t \)
(2) \( \frac{E A \alpha t}{1+\alpha} \)
(3) \( \frac{E A \alpha t}{1-\alpha} \)
(4) Elot
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