Two wires A and B have the same cross-section and are made of the same material, but the length of wire A is twice that of B. Then for a give load.

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The extension of A will be twice that of B.

The strain in A will be twice that of B.

The strains in A and B will be equal.

both (1) and (3) are correct.

answer is D.

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Detailed Solution

Stress developed in the rods will be the same.Extension δ=F.lAY⇒δ∝l. So (1) is correct.Also, strain = stressYoung's modulus. So, (3) is also correct.Hence option-(4) is correct.

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