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Fundamental and Derived Units

The pitch of ...

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The pitch of a screw gauge is 1 mm with 100 CSD. In measurement of thickness of a wire, there are 3 divisions on linear scale and 25 divisions on circular scale coinciding with reference line. If nothing is put between the studs then 20^th division of circular scale is coinciding with reference line such that zero of linear scale is visible, then thickness of wire is

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