A wire elongates by \( 1 \mathrm{~mm} \) when a load \( \mathrm{W} \) is hanged from it. If the ...

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A wire elongates by \( 1 \mathrm{~mm} \) when a load \( \mathrm{W} \) is hanged from it. If the wire goes over a pulley and two weights \( \mathrm{W} \) each are hung at the two ends, the elongation of the wire will be (in mm)
[AIEEE 2006]
(a) 21
(b) Zero
(c) \( 1 / 2 \)
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