JEE Main 2008Annual, Paper 1PhysicsMediumExperimental Skills34× since 2008
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 divisions 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 divisions in line with the main scale as 35. The
diameter of the wire is