When a uniform wire of radius \( \mathrm{r} \) is stretched by a \(...

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When a uniform wire of radius \( \mathrm{r} \) is stretched by a \( 2 \mathrm{~kg} \) weight,
P the increase in its length is \( 2.00 \mathrm{~mm} \). If the radius of the wire
\( \mathrm{V} \) is \( \mathrm{r} / 2 \) and other conditions remain in the same, increase in its length is
a. \( 2.00 \mathrm{~mm} \)
b. \( 4.00 \mathrm{~mm} \)
c. \( 6.00 \mathrm{~mm} \)
d. \( 8.00 \mathrm{~mm} \)
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