A composite rod consists of a steel rod of length 25 cm and area 2A and a copper rod of length 50 cm and area A. The composite rod is subjected to an axial load F. If the Young’s modulus of steel and copper are in the ratio 2 : 1.
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Question

A composite rod consists of a steel rod of length 25 cm and area 2A and a copper rod of length 50 cm and area A. The composite rod is subjected to an axial load F. If the Young’s modulus of steel and copper are in the ratio 2 : 1.

Select all that apply

G1 Physics · Accepted Answer

Use stress σ=F/A, strain ε=ΔL/L and Young's modulus Y=σ/ε. For a uniform segment, ΔL=FL/(AY); for thermal restraint, thermal strain αΔT produces stress YαΔT. Evaluating the given data/statements gives A: the extension produced in copper rod will be more .; C: the stress applied to the copper rod will be more.. Therefore the correct answer is A, C.