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A screw gauge having `100` equal division and a pitch of length `1mm` is used to measue the diameter of a wire of length `5.6cm`. The main scale reading is `1mm and 47^(th)` circular division coincides with the scale. Find the curved surface area of wire in `cm^(2)` to appropriate significant fihure. `(use pi = (22)/(7)` |
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Answer» Correct Answer - 2.6 Least count`=(1mm)/(100)=0.01mm` `Diameter=MSR+CSR` `=1mm+47(0.01)mm=1.47mm` Surface are `piDl=(22)/(7)xx1.47xx56mm^(2)` `=2.58724cm^(2)=2.6cm^(2)` |
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