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

Options

A. `0.52 cm`
B. `0.052 cm`
C. `0.026 cm`
D. `0.005 cm`

Answer

B

Explanation

(2) Least count `= (1)/(100) = 0.01 mm` Diameter = main scale reading + least count
`xx` divisions on circular scale
`= 0 + 0.01 xx 50 = 0.52 mm = 0.052 cm`