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Wrapping it around a pencil and measuring the length of turns with the help of a meter scale. Is this approach more accurate than determining the diameter of the wire with the help of a screw gauge? - Physics

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Question

We can find the diameter of a wire by wrapping it around a pencil and measuring the length of turns with the help of a meter scale. Is this approach more accurate than determining the diameter of the wire with the help of a screw gauge?
Short Note

Solution

No, we cannot measure the diameter of a wire by wrapping it around a pencil because it is not very accurate. We can use a screw gauge for this purpose as it can measure the diameter correct up to 1/100 of a millimeter or even less.
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Chapter 1: Measurement - Exercise 5 [Page 48]

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Frank Physics [English] Class 9 ICSE
Chapter 1 Measurement
Exercise 5 | Q 47 | Page 48
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