Two full turns of the circular scale of a screw gauge cover 1 mm on the main scale. The circular scale has 50 divisions. The gauge has a zero error of -0.03 mm. Measuring a wire, the main scale reads 3 mm and 35 circular divisions are in line with the main scale. The diameter of the wire is

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(1) 3.38 mm. Pitch =(1 mm)/2=0.5 mm; L.C. =(0.5)/(50)=0.01 mm. Observed =3+35×0.01=3.35 mm. Negative error -0.03 mm: corrected =3.35-(-0.03)=3.38 mm.

Two full turns of the circular scale of a screw gauge cover 1 mm on the main scale. The circular scale has 50 divisions. The gauge has a zero error of -0.03 mm. Measuring a wire, the main scale reads 3 mm and 35 circular divisions are in line with the main scale. The diameter of the wire is

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Why the other options are wrong