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Error and Uncertainty

The diameter ...

Question

The diameter D of a wire is measured using screw gauge of zero error. Then:

A

D =

main scale reading + circular scale divison

\times

LC

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B

D =

circular scale reading + circular scale reading

\times

LC

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C

D =

main scale reading + vernier scale reading

\times

LC

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D

None of the above

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Solution

The correct option is C $D =$ main scale reading + circular scale divison $\times$ LC
The diameter $D$ of the wire is given as :

$D =$ main scale reading +circular scale divison $\times$ L.C
where $L . C .$ is least count of the screw gauge.

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