When a screw gauge of the least count 0.01 mm is used to measure the diameter of the wire, the linear scale reading is 2 mm and 28th division of circular line coincides with the reference line. What is the diameter of the wire? If the screw gauge has a zero error of -0.04 mm, calculate the corrected diameter of the wire.
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Least count =
Diameter = M. S. +( No. of division coinciding with main scale × Least count.)
= 1 mm + 47 × 0.01 mm
= 1.47 mm = 0.147 cm.
Curved surface area = πdL =
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