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The main scale of a vernier callipers re...

The main scale of a vernier callipers reads in millimeter and its vernier is divided into 10 divisions which coincides with 9 divisions of the main scale. The reading for shown situation is found to be `(x//10)`mm. Find the value of x.
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The correct Answer is:
69
Least count `= (1"mm")/(10)=0.1` mm, Zero error `=-(10-6)xx0.1=-0.4` mm
Reading `=6 + 5 xx (0.1)-(0.4)=6.9` mm
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ALLEN-ERROR AND MEASUREMENT-Part-2(Exercise-2)(B)
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