ï»¿ Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of âˆ’ 0.03 mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is from Physics Units and Measurement Class 11 Manipur Board

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Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of âˆ’ 0.03 mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is

• 3.32 mmÂ

• 3.73 mm

• 3.67 mm

• 3.38 mm

D.

3.38 mm

Diameter = M.S.R. + C.S.R Ã— L.C. + Z.E.
= 3 + 35 Ã— (0.5/50) + 0.03
= 3.38 mm

Diameter = M.S.R. + C.S.R Ã— L.C. + Z.E.
= 3 + 35 Ã— (0.5/50) + 0.03
= 3.38 mm

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