QJEEM22Ph99fa: JEE Main 2022 Physics - Class 11 JEEM22Ph99fa Solution: In an experiment to find out the diameter of wire using screw…

Question

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In an experiment to find out the diameter of wire using screw gauge, the following observations were noted :

JEE Main 2022 (Online) 29th July Morning Shift Physics - Units & Measurements Question 70 English

(A) Screw moves $0.5 \mathrm{~mm}$ on main scale in one complete rotation

(B) Total divisions on circular scale $=50$

(C) Main scale reading is $2.5 \mathrm{~mm}$

(D) $45^{\text {th }}$ division of circular scale is in the pitch line

(E) Instrument has 0.03 mm negative error

Then the diameter of wire is :

Accepted Answer

L.C. = ${{0.5} \over {50}}$ mm = 0.01 mm

$d = (2.5 + 45 \times 0.01 + 0.03)$ mm

= 2.98

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