The pitch of a screw gauge is 0.5 mm and there are 100 divisions on it circular scale. The instrument reads +2 divisions when nothing is put in-between its jaws. In measuring the diameter of a wire, there are 8 divisions on the main scale and 83rd division coincides with the reference line. Then the diameter of the wire is
Text Solution
Verified by ExpertsThe correct answer is:
B
Δ λ = 0.5 mm
N = 100 divisions
zero correction = 2 divisions
Reading = Measured value + zero correction
= (8 × 0.5) mm + (83 – 2) × 
.
= 4 mm + 81 × 
mm
= 4.405 mm
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