Q 11-01-138JEE MainJEE Main 2023 (10 Apr, Shift 2)Medium
In an experiment with vernier callipers of least count $0.1\ \text{mm}$, when two jaws are joined together the zero of vernier scale lies right to the zero of the main scale and $6^\text{th}$ division of vernier scale coincides with the main scale division. While measuring the diameter of a spherical bob, the zero of vernier scale lies in between $3.2\ \text{cm}$ and $3.3\ \text{cm}$ marks and $4^\text{th}$ division of vernier scale coincides with the main scale division. The diameter of bob is measured as
Answer: (B) $3.18\ \text{cm}$
Zero error (positive, vernier zero to the right) $=6\times0.01=0.06\ \text{cm}$.
Reading $=3.2+4\times0.01=3.24\ \text{cm}$; corrected diameter $=3.24-0.06=3.18\ \text{cm}$.
Solution by Sreeraj P, M.Sc Physics