JEE MAIN - Physics (2021 - 17th March Morning Shift - No. 15)
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)
8.58 cm
8.54 cm
8.56 cm
8.36 cm
Explanation
Reading = MSR + VSD $$\times$$ LC $$-$$ zero error
Reading = 8.5 + $${{(0.1) \times 6} \over {10}} - {{0.2} \over {10}} = 8.54$$ cm
Reading = 8.5 + $${{(0.1) \times 6} \over {10}} - {{0.2} \over {10}} = 8.54$$ cm
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