When a screw gauge of the least count 0.01 mm is used to measure the diameter of the wire, the linear scale reading is 2 mm and 28th division of circular line coincides with the reference line. What is the diameter of the wire? If the screw gauge has a zero error of -0.04 mm, calculate the corrected diameter of the wire.
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Answer:
D
3.74mm
Zero error
Least count =0.02
Screw gauge reading
=−6×
50
1
mm=−0.12 mm
mm
=3+31×0.02 mm
=3.62 mm
Diameter of wire
=3.62 - Zeroerar
=3.62−(−0.12)
=3.74 mm
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