A screw gauge having 100 equal
divisions and a pitch of a length 1 mm
is used to measure the diameter of a
wire of length 5.6cm. The main scale
reading is 1mm and 47th circular
division coincides with the main scale.
The curved surface area of the wire to
the approximate significant figures is
2.60
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gauge =
Numberofdivisionsoncircularscale
Pitch
= 1/100
=0.01mm
Given : Main scale reading =1 mm
Circular scale reading =0.01×47=0.47
∴ Diameter of wire = Total reading =1.47mm=0.147cm
Curved surface area = π×dl=π×(0.147)(5.6)=2.586≈2.6cm^2
Hope it helps
Numberofdivisionsoncircularscale
Pitch
= 1/100
=0.01mm
Given : Main scale reading =1 mm
Circular scale reading =0.01×47=0.47
∴ Diameter of wire = Total reading =1.47mm=0.147cm
Curved surface area = π×dl=π×(0.147)(5.6)=2.586≈2.6cm^2
Hope it helps
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