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A copper wire of 1 mm diameter is stretched by applying a force on 10N. Find the stress in the wire.

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1.273 × 10⁷ N/m²

1.373 × 10⁷ N/m²

1.473 × 10⁷ N/m²

answer is A.

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Detailed Solution

$r = \frac{1}{2} = 0.5 mm = 5 x 10^{- 4} m; F = 10 N$
Stress $= \frac{F}{A} = \frac{F}{{πr}^{2}}$
Stress $= \frac{10}{3.14 x 25 x 10^{- 8}} = 1.273 x 10^{7} N / m^{2}$

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