Q.
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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a
8.56 cm
b
8.54 cm
c
8.36 cm
d
8.58 cm
answer is B.
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Detailed Solution
Main scale reading = 8.5Vernier coincidence = 6 Reading = M S R+NLC =8.5+60.01 =8.5+0.06=8.56 cm Zero error of scale =0.02 cmAs zero error is positive, correction is negative Correct reading=8.56−0.02=8.54 cm
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