Physics
When is a vernier callipers said to be free from zero error?
Measurements
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Answer
On bringing, the movable jaw in contact with the fixed jaw, the zero mark of the vernier scale should coincide with the zero mark of the main scale. In this position, the tenth division of the vernier callipers coincides with the ninth division of the main scale.
If it is so, the vernier is said to be free from zero error.
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