11 PHYSICS EXPERIMENT NO. 2 USE OF MICROMETER SCREW GAUGE

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 11 PHYSICS EXPERIMENT NO. 2

USE OF MICROMETER SCREW GAUGE

Aim To measure

1) The diameter of a given wire and calculate its area of cross section

2) Thickness of glass plate.

Apparatus: Screw gauge, wire, glass plate

Diagram

Formula 

1. Least Count of the Screw Gauge= Smallest Division on Main Scale/Total No. Of Divisions On Circular Scale.

L.C. Of MICROMETER SCREW GAUGE =0.1/10=0.01cm

Observations 1. Determination of Least Count of the Screw Gauge a )Smallest division on main scale,

S=1 mm. b)Number of full rotations given to screw, n=4 c)Distance moved by the screw on main scale, D=4 mm. d)Hence, pitch p=1 mm. e)Number of divisions on circular scale, N=100 f)Hence, least count, L.C.= 0.01 mm

= 0.001 cm.

Zero error = ----0----mm ---0---cm





 

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