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  4. In a series combination of copper and steel wires of same length and same diameter, a force is applied at one of their ends while the other end is kept fixed. The combined length is increased by 2 cm. The wires will have

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Q. In a series combination of copper and steel wires of same length and same diameter, a force is applied at one of their ends while the other end is kept fixed. The combined length is increased by $2\, cm$. The wires will have

Mechanical Properties of Solids

Solution:

Stress $=\frac{F}{A}$
Force is same, $A$ is same
So same stress
Strain $=\frac{\Delta L}{L}$
$L$ is same, but due to different young's modulus (Material's different)
$\Delta L$ would be different so strain is different