As shown in figure, by combining together copper and steel wires of same length and same diameter, a force F is applied at one of their end. The combined length is increased by 2 cm. The wires will have

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Different stress and same strain

Same stress and different strain

Different stress and different strain

Same stress and same strain

answer is D.

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Detailed Solution

Applied force is same and Cross- sectional area is also same

∴ stress = (F/A) = same

$Strain = \frac{Stress}{Y}$

Since Y is different, strain is also different.

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