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JEE Main Physics question

PhysicsUnits and MeasurementJEE Main

Two full turns of the circular scale of a screw gauge cover a distance of on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of . While measuring the diameter of a thin wire, a student notes the main scale reading of and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is

Answer: (C)

Solution

Since two full turns cover , the pitch is , so the least count is . The observed reading is

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Question ID VK-157443