The least count of the main scale of a screw gauge is 1 mm . The minimum number of divisions on its circular scale required to measure 5 μm diameter of a wire is:

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Least count of screw gauge = 5 μm L . C = p i t c h n o . o f d i v o n c i r x u l a r s c a l e 5 μm = 1 mm N N = 200

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