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 : (1) 0.052 cm (2) 0.52 cm (3) 0.026 cm (4) 0.26 cm
Option 1) Here, pitch of the screw gauge, p=1 mm Number of circular divisions, n=100 Thus, least count LC=p/n=1/100=0.01 mm=0.001 cm Diameter of the wire =MSR+(CSR×LC)=0+(52×0.001cm)=0.052 cm
