d
\(\text { Least count }=\frac{\text { Pitch }}{\text { No. of circular divisions }}\)

\(=\frac{0.5\,mm }{100}\)

\(\text { Least count }=5 \times 10^{-3}\,mm\)

\(\text { Positive Error }= MSR + CSR ( LC )\)

\(=0\,mm +6\left(5 \times 10^{-3}\,mm \right)\)

\(\text { Reading of Diameter }= MSR + CSR ( LC )-\)

\(\text { Positive zero error }\)

\(=4 \times 0.5\,mm +\left(46\left(5 \times 10^{-3}\right)\right)-6\left(5 \times 10^{-3}\right)\,mm\)

\(=2\,mm +40 \times 5 \times 10^{-3}\,mm =2.2\,mm\)