A screw gauge has a screw having 2 threads in 1mm. The circular scale has 50 divisions. Find the diameter of wire, if the main scale shows 6th division and the circular reads 4
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a
6.46 mm
b
3.46mm
c
6.54mm
d
3.04mm
answer is D.
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Detailed Solution
Least count=pitchNumber of divisions=0.550=0.01 mmDiameter of wire=6×0.5+4×0.01=3.04mmTherefore, the correct answer is (D).