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A wire of length ' \( l \) ' and radius ' \( r \) ' is clamped rigidly at one end. When the other end of the wire is pulled by a force ' \( F \) ',
P its length increases by ' \( x \) '. Another wire of same material of length ' \( 2 \mathrm{l}^{\text {' }} \) and radius ' \( 2 \mathrm{r} \) ' is pulled by a force ' \( 2 F \) ', the increase in its length will be
a. \( x \)
b. \( 2 x \)
c. \( x / 2 \)
d. \( 4 x \)
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