A vernier caliper has least count 0.1 mm. When its jaws are closed, the zero of the vernier scale lies to the right of the main-scale zero and the 6th vernier division coincides with a main-scale division. While measuring a spherical bob, the vernier zero lies between 3.2 cm and 3.3 cm and the 4th vernier division coincides. The corrected diameter is:
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Question

A vernier caliper has least count 0.1 mm. When its jaws are closed, the zero of the vernier scale lies to the right of the main-scale zero and the 6th vernier division coincides with a main-scale division. While measuring a spherical bob, the vernier zero lies between 3.2 cm and 3.3 cm and the 4th vernier division coincides. The corrected diameter is:

Options

G1 Physics · Accepted Answer

Positive zero error: zero error = 6×0.1 mm = 0.6 mm = 0.06 cm Observed reading: main-scale reading = 3.2 cm vernier contribution = 4×0.1 mm = 0.4 mm = 0.04 cm Observed diameter: 3.2 + 0.04 = 3.24 cm For positive zero error, subtract the zero error: corrected diameter = 3.24 − 0.06 = 3.18 cm Hence option C follows.