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Question

# 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 gets increased by 2 cm. The wires will have

A
Same stress and same strain
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B
Different stress and different strain
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C
Different stress and same strain
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D
Same stress and different strain
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Solution

## The correct option is D Same stress and different strainStress =FA Force(F) is same, A is same. So stress will be same. Strain =ΔLL L is same, but due to different young's modulus, ΔL would be different for copper and steel wire so strain is different . ∵Stress=Y×Strain

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