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Two full turns of the circular scale of ...

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 division on the circular scale is 50. Further, it is found that the screw gauge has a zero error of `-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 division in line with the main scale as 35. The diameter of the wire is

A

`3.32mm`

B

`3.73 mm`

C

`3.67mm`

D

3.38mm`

Text Solution

Verified by Experts

Least count of screw gague
`=(0.5)/(50) mm = 0.01 mm`
`:.` Reading =[Main scale reading + circular scale reading `xx L.C` -(zero error)
`=[3+35 xx 0.01] - (-0.03) = 3.38 MM` .
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