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Vernier Caliper

Find the zero...

Question

Find the zero error in figure given

A

0.3 mm

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B

-0.3 mm

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C

-0.7 mm

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D

0.7 mm

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Solution

The correct option is A 0.3 mm
Since, the zero of vernier scale is ahead of zero of main scale. So the error is positive zero error.
Least count of the vernier calliper $L . C . = 0.1 m m$
Since the $3 r d$ division matches with the main scale division.
Zero error $= n \times L . C . = 3 \times 0.1 = 0.3 m m$

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