Experimental Physics
1 JEE Physics previous year questions on Experimental Physics — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.
Q1 FREE PREVIEW
One main scale division of a vernier calipers is ' a ' cm and \({n}^{\text{th }}\) division of the vernier scale coincide with \((n-1{)}^{\text{th }}\) division of the main scale. The least count of the calipers (in mm ) is:
✓ Correct answer: c)
\(\frac{10a}{n}\)
Explanation
\[
(n-1) M S D=n V S D \Rightarrow V S D=\frac{n-1}{n}(M S D)
\]
Now, L.C \(=[1 \mathrm{MSD}-1 \mathrm{VSD}] \mathrm{cm}\)
\[
\begin{aligned}
& =a-\frac{n-1}{n} a=\frac{a}{n} \mathrm{~cm} \\
& =\left(\frac{10 a}{n}\right) \mathrm{mm}
\end{aligned}
\]
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