A rod of length \( L \) kept on a smooth horizontal surface is pulled along its length by a forc....

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A rod of length \( L \) kept on a smooth horizontal surface
\( \mathrm{P} \)
is pulled along its length by a force \( F \). The area of
W
cross-section is \( A \) and Young's modulus is \( Y \). The extension in the rod is
(1) \( \frac{F L}{A Y} \)
(2) \( \frac{2 F L}{A Y} \)
(3) \( \frac{F L}{2 A Y} \)
(4) Zero


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