Two wires are made of the same material and have the same volume. T...

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Two wires are made of the same material and have the same volume. The first wire has cross-sectional
\( \mathrm{P} \) area \( A \) and the second wire has cross-sectional area \( 3 A \). If the length of the first wire is increased by \( \Delta l \) on applying a force \( F \), how much force is needed to stretch the second wire by the same amount?
(a) \( 9 F \)
(b) \( 6 F \)
(c) \( 4 F \)
(d) \( F \)
\( (N E E T) \)
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