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A screw gauge has 50 divisions on its ci...

A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking , prior to use. Upon one complete ratation of the circular scale, a displacement of 0.5 mm is noticed on the pitch scale . The nautre of zero error involved , and the least count of the screw gauge, are respectively.

A

Negative , 2 `mu `m

B

Positive , 10 `mu ` m

C

Positive , `0.1 mm`

D

Positive , 0.1 `mu ` m

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