JEE Main 2024 Physics question
There are 100 divisions on the circular scale of a screw gauge of pitch 1 mm. With no measuring quantity in between the jaws, the zero of the circular scale lies 5 divisions below the reference line. The diameter of a wire is then measured using this screw gauge. It is found the 4 linear scale divisions are clearly visible while 60 divisions on circular scale coincide with the reference line. The diameter of the wire is:
Answer: (B)
Solution
Least count = 0.01 mm. Zero error = +5 × 0.01 = +0.05 mm (zero below the reference
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