The Vernier scale used for measurement has a positive zero error of 0.2 mm. If while taking a measurement it was noted that ‘0’ on the Vernier scale lies between 8.5 cm and 8.6 cm, Vernier coincidence is 6, then the correct value of measurement is _____cm. [least count = 0.01 cm]

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8.36 cm

8.58 cm

8.54 cm

8.56 cm

answer is B.

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Detailed Solution

Main scale reading = 8.5
Vernier coincidence = 6
Reading = $M S R + N (LC)$ $= 8.5 + 6 (0.01)$ $= 8 .5 + 0 .06 = 8.56 cm$
Zero error of scale $= 0 .02 cm$
As zero error is positive, correction is negative
Correct reading $= 8 .56 - 0 .02 = 8.54 cm$

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