A vernier callipers has a least count of 0.01 cm (10 vernier divisions).
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A vernier callipers has a least count of ( vernier divisions). With the jaws closed, the vernier zero is to the left of the main zero, and the th vernier line coincides. A cylinder is then measured: the main scale reads and the th vernier line coincides. What is the cylinder's diameter?
Need a reminder? The key ideaShow
If vernier divisions fill main scale divisions, the least count is one main division divided by .
Correct reading observed reading zero error. With the jaws closed, a vernier zero to the right of the main zero is a positive zero error; to the left, a negative one.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Zero error. The vernier zero is behind the main zero by : zero error .
Step 2. Observed. .
Step 3. Correct. .
Answer: .
Check. A negative zero error means the callipers read too little, so the true size is larger than . Yes.
Watch out. For a negative zero error, the coinciding line counts from the end of the vernier: , not .
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