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 is pulled along its length by a force \( F \). The area of cross-section is \( A \) and Youngs modulus is \( Y \). The extension in the rod is
- (a) \( \frac{F L}{A Y} \)
(b) \( \frac{2 F L}{A Y} \)
- (c) \( \frac{F L}{2 A Y} \)
(d) Zero
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