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JEE Advanced · Physics · 29. Experimental Physics

Area of the cross-section of a wire is measured using a screw gauge. The pitch of the main scale is 0.5 mm. The circular scale has 100 divisions and for one full rotation of the circular scale, the main scale shifts by two divisions. The measured readings are listed below.
Measurement condition Main scale reading Circular scale reading
Two arms of gauge touching each other without wire 0 division 4 divisions
Attempt-1: With wire 4 divisions 20 divisions
Attempt-2: With wire 4 divisions 16 divisions
What are the diameter and cross-sectional area of the wire measured using the screw gauge?

  1. A 2.22±0.02mm, π1.23 ± 0.02mm2
  2. B 2.22±0.01mm,π1.23±0.01mm2
  3. C 2.14±0.02mm,π1.14±0.02mm2
  4. D 2.14±0.01mm,π1.14±0.01mm2
Verified Solution

Answer & Solution

Correct Answer

(C) 2.14±0.02mm,π1.14±0.02mm2

Step-by-step Solution

Detailed explanation

Note: This question is given bonus by JEE council. In one rotation 2 divisions of the main scale are crossed. Therefore, the least count of the screw gauge is
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