JEE Main 2024 Physics question
While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm and circular scale reading is equal to 42 divisions. Pitch of screw gauge is 1 mm and it has 100 divisions on circular scale. The diameter of the wire is mm. The value of x is:
Answer: (B)
Solution
Least count = 0.01 mm; diameter = 1 + 42 × 0.01 = 1.42 mm = 71/50 mm.