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In a vernier calliper, vernier scale has 20 division which match with 19^(th) division of main scale. The least count of main scale is 1 mm. When two jaws of vernier calliper is in contact, zero of main scale is visible and 14^(th) vernier scale division match with a main scale division. In measuring the length of iron rod by this instrument, main scale reads 35 division and 8^(th) division of vernier scale coincides with a main scale division. Find length of rod in cm. |
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Answer» 20 VSD = 19 MSD LEAST count = MSD - VSD = 0.005cm +ve zero error = `14 xx LC = .070 cm` MEASURED LENGTH `= MSR + VSR xx LC - (+ve "error")` `= 3.5 xx 0.1 + 8 xx 0.005 - 0.070` `= 3.5 + 0.040 - 0.070` `=3.500 - 0.030 = 3.47 cm`. |
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