A screw gauge gives the following readings when used to measure the diameter of a wire. \ Main scal

Question

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

Professor PC Thomas Classes · Answer

Least count $= \frac{1}{100} = 0.01 	ext{ mm}$. Reading $= 0 + 52 	imes 0.01 = 0.52 	ext{ mm} = 0.052 	ext{ cm}$.