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JEE Main202117 Mar 2021Morning ShiftPhysicsExperimental PhysicsActual

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 )

Options

  1. A8 . 36   cm
  2. B8 . 54   cm
  3. C8 . 58   cm
  4. D8 . 56   cm

Correct answer

B. 8 . 54   cm

Step-by-step solution

Positive zero error = 0 . 2   mm Main scale reading = 8 . 5   cm Vernier scale reading = 6 × 0 . 01 = 0 . 06   cm Final reading = 8 . 5 + 0 . 06 - 0 . 02 = 8 . 54   cm

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