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A vernier scale is used in a fortin barometer 10 VSD coincides with 19 MSD and 1 MSD =1 mm and VSD is further divided in two .Least count is -

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A vernier scale is used in a fortin barometer 10 VSD coincides with 19 MSD and 1 MSD =1 mm and VSD is further divided in two .Least count is -
A. 0.1 cm
B. .05 mm
C. 1 mm
D. 0.02mm
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Correct Answer - B
`1 VSD =(19)/(2xx10)MSD`
`LC =1 MSD - 1 VSD =1 - (19)/(20)mm`
`=(1)/(20)mm =0.5 mm`
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