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1. How will you find the thickness of a one rupee coin?
Solution:
To find the thickness of a one rupee coin,
- Determine the pitch, the least count and the zero error of the screw gauge.
Pitch:
Least count:
\(Least count\ (LC)\ =\) \(mm\)
Zero error:
\(Positive\ zero\ error\ (ZE)\ =\)
So, \(Zero\ correction\ (ZC)\ =\)
\(Negative\ zero\ error\ (ZE)\ =\)
So, \(Zero\ correction\ (ZC)\ =\)
- Place the coin between the two studs.
- Rotate the head until the coin is held firmly but not tightly, with the help of the ratchat.
- Observe the reading of the pitch scale crossed by the head scale (PSR) and the head scale division that coincides with the pitch scale axis (HSC).
- The thickness of the coin is given by . Repeat the experiment for different positions of the coin.
- Tabulate the readings.
- The average of the last column readings gives the thickness of the coin.
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