STANDARD Physics Young's Modulus MCQ Question
The following four wires of length L and radius r are made off the same material. Which of these will have the largest extension, when the same tension is applied?
L = 100 cm, r = 0.2 mm
L = 200 cm, r = 0.4 mm
L = 300 cm, r = 0.6 mm
L = 400 cm, r = 0.8 mm
Correct Answer
Detailed Explanation
The extension in a wire is proportional to L/r². For the given options, L/r² is maximum for the wire with L = 100 cm and r = 0.2 mm, hence it will have the largest extension.
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