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Zero Error in Vernier Caliper

A boy uses a ...

Question

A boy uses a vernier calipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of vernier calipers is +0.02 cm, what is the correct thickness of pencil?

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Solution

Given: Thickness of the pencil = 1.4 mm
Zero error = +0.02 cm
Actual thickness = ?
Correct reading $=$ observed reading $-$ zero error
$= 1.4 m m - 0.02 c m$
$= 1.4 m m - 0.2 m m$

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