JEE Main Physics question
The pitch of a screw gauge is 1 mm and there are 100 divisions on the circular scale. While measuring the diameter of a thick wire, the pitch scale reads 1 mm and the 63rd division on the circular scale coincides with the reference. The length of the wire is 5.6 cm.
Answer: (A),(B),(C),(D)
Solution
Least count , confirming (A). Diameter =1\,mm+63\times0.01\,mm=1.63\,mm=0.163\,cm, confirming (B). Cross-section area $=π
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