Question

#Moderatorschallenge

can u plzz explain how they find or calculated negative and positive zero error of Vernier callipers.

I want verified answer ☑️✅

NOTE
Ms: main scale
VS:vernier scale

explain me clearly


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Answer 1

Answer:

To learn calculating positive zero error and negative zero error, let us take one home example for each.

FOR POSITIVE ZERO ERROR –

Positive zero error occurs when zero of the vernier scale is is ahead of the zero of the main scale.

For the example refer the diagram 1.

The formula is : Positive zero error = Coinciding VS division × Least count.

Now, In the Example I gave :

• Coinciding division of vs is 2.
• The least count is 0.01 cm.

Hence, Error = 2 × 0.01

➸ 0.02 cm.

Note : The sign of the positive zero error is +.

FOR NEGATIVE ZERO ERROR —

Negative zero error occurs when the zero of the vernier scale is behind the zero of the main scale.

For the example refer the diagram 2.

The formula is : Negative zero error = (Total no. of divisions of vs - Coinciding division of vs) × Least count.

Now, In the Example I gave :

• Coinciding division of vs is 3.
• Total no. of divisions in vs are 10.
• Least count is 0.01 cm.

Hence, Error = (10 - 3) × 0.01

➸ 7 × 0.01

➸ -0.07 cm.

Note : The sign of the negative zero error is -.

Point to remember :

• The least count of vernier scale is 0.1 mm or 0.01 cm.
• The divisions on the vernier scale is 10. But sometimes ut can be 20 too.

Now, let's deal with your diagrams :

Negative zero error -

• Coinciding division of vernier scale = 4.
• Total number of divisions in vs = 10.
• Least count = 0.01 cm.

Hence, Negative zero error = (Total no. of divisions of vs - Coinciding division of vs) × Least count.

➸ Error = (10-4) × 0.01

➸ Error = 6 × 0.01

➸ Error = - 0.06 cm.

Positive zero error -

• Coinciding division of vernier scale = 7.
• Least count = 0.01 cm.

Hence, Positive zero error = Coinciding VS division × Least count.

➸ Error = 7 × 0.01

➸ Error = + 0.07 cm.