JEE Main 2026 · Session 2 · Shift 1 · Physics
Question 27
The diameter of a wire measured by a screw gauge of least count 0.001 cm is 0.08 cm. The length measured by a scale of least count 0.1 cm is 150 cm. When a weight of 100 N is applied to the wire, the extension in length is 0.5 cm, measured by a micrometer of least count 0.001 cm. The error in the measured Young's modulus is α × 10⁹ N/m². The value of α is ____. (Ignore the contribution of the load to Young's modulus error calculation)
- A. 1.3
- B. 1.65Correct answer
- C. 0.13
- D. 0.25
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Official source
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Question paper, page 10-11.