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The given graph shows the extension \( (\Delta l) \) of a wire of length \( 1.0 \mathrm{~m} \) suspended from the top of a
P roof at one end and a load be connected to the W other end. If the cross-sectional area of the wire is \( 10^{-6} \mathrm{~m}^{2} \), the Young's modulus ( \( Y \) ) of the material of the wire must be :-
(1) \( 2 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2} \)
(2) \( 2 \times 10^{12} \mathrm{~N} / \mathrm{m}^{2} \)
(3) \( 3 \times 10^{12} \mathrm{~N} / \mathrm{m}^{2} \)
(4) \( 2 \times 10^{7} \mathrm{~N} / \mathrm{m}^{2} \)
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