Physics · 2022
JEE Main · 26 July 2022, Shift 1 · Q50
A screw gauge of pitch 0.5 mm is used to measure the diameter of uniform wire of length 6.8 cm, the main scale reading is 1.5 mm and circular scale…
A screw gauge of pitch $\displaystyle 0.5$ mm is used to measure the diameter of uniform wire of length $\displaystyle 6.8$ cm, the main scale reading is $\displaystyle 1.5$ mm and circular scale reading is $\displaystyle 7$ . The calculated curved surface area of wire to appropriate significant figures is :
[Screw gauge has $\displaystyle 50$ divisions on its circular scale]
Official answer
(2)
$\displaystyle 3.4 \mathrm{~cm}^2$
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