A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mm Circular scale reading : 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is :

0.052

L.C. = $\frac{Pitch}{CSD}$=$\frac{1mm}{100}$ = 0.01 mm = 0.001 cm

Radius = M.S. + CSR(L.C) = 0 + 52 (0.001)cm = 0.052 cm