First slide

Measurement

Question

In the diagram shown in figure, find the magnitude and nature of zero error.

Moderate

A

-0.01
B

-0.05
C

0.01
D

0.05

Solution

Here, zero of Vernier scale lies to the right of zero of main scale, hence, it has positive zero error.
N=0, x=5, $LC = 0.01 cm$
$Z e r o e r r o r = N + x \times VC$
$= 0 + 5 \times 0.01 = 0.05 cm$
Zero correction = $- 0.05 cm$
Therefore, actual length will be 0.05 cm less than the measured length.

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