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When the studs of a screw gauge are i...

When the studs of a screw gauge are in contact the position of the head of the screw is as shown below Determine the zero error,

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The knife -edge in a physical balance increase its sensitivity.
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PEARSON IIT JEE FOUNDATION-MEASUREMENTS-Level 2
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  17. Name the part of the physical balance which is used to increase it...

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