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CBSE Class 9 Answered

vernier callipers
Asked by | 17 Jul, 2009, 07:12: AM
answered-by-expert Expert Answer

On bringing the movable jaw in contact with the fixed jaw, the zero of the main scale should coincide with the zero of the vernier scale. If it is not so, the vernier is said to have zero error.

If the zero mark of the vernier scale is on the right of the zero mark of the main scale, the error is said to be positive. To find this error, we note that division of the vernier scale which coincides with any division of the main scale. The no. of this vernier division multiplied by the least count of the vernier, gives the zero error.

If the zero mark of the vernier scale is on the leftt of the zero mark of the main scale, the error is said to be negative.To find this error, we note that division of the vernier scale which coincides with any division of the main scale. The no. of this vernier division is subtracted from the total no. of divisions on the vernier scale and then the difference is multiplied by the least count.

Correct Reading = Observed reading - zero error ( with sign).

 

Answered by | 17 Jul, 2009, 02:50: PM

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