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A screw gauge gives the following reading 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 of the circular scale.

The diameter of wire from the above data is :

  • Option 1)

    0.52 cm

  • Option 2)

    0.052 cm

  • Option 3)

    0.026 cm

  • Option 4)

    0.005 cm

 
As we learnt in  To measure the diameter of small spherical cylindrical body using Vernier Callipers - Vernier Constant = 1 Main scale division - 1 V.S. Division  V.C= 1 M.S.D - 1 V.S.D M.S.D=  Main Scale Reading V.S.D= Vernier Scale Reading   - wherein Total observed reading =  N= Nth division  Observations:  1.    Vernier constant (least count) of the Vernier Callipers:                     ...
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