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In an experiment to find out the diameter of wire using screw gauge, the following observation were noted : (a) Screw moves 0.5 mm on main scale in one complete rotation (b) Total divisions on circular scale = 50 (c) Main scale reading is 2.5 mm (d) 45th division of circular scale is in the pitch line (e) Instrument has 0.03 mm negative error Then the diameter of wire is :

1. 2.92 mm
2. 2.54 mm
3. 2.98 mm
4. 3.45 mm

Correct answer: 2.98 mm

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