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A screw gauge has 50 division on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5 mm is noticed on the pitch scale. The nature of zero error involved, and the least count of the screw gauge are respectively.
Option: 1 positive, $0.1\mu m$

Option: 2 positive, $0.1mm$
Option: 3 negative, $2\; \mu m$
Option: 4 positive, $10\; \mu m$

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