Physics · 2021
JEE Main · 16 March 2021, Shift 1 · Q20
One main scale division of a vernier callipers is ' a ' cm and n^th division of the vernier scale coincide with ( n -1)^th division of the main…
One main scale division of a vernier callipers is ' a ' cm and $\displaystyle \mathrm{n}^{\text {th }}$ division of the vernier scale coincide with $\displaystyle (\mathrm{n}-1)^{\text {th }}$ division of the main scale. The least count of the callipers in mm is :
Official answer
(3)
$\displaystyle \frac{10 \mathrm{a}}{\mathrm{n}}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.