A Vernier callipers of least count 0.1 mm has positive zero error: with jaws closed, the 6th Vernier division coincides. While measuring a spherical bob, the Vernier zero lies between 3.2 cm and 3.3 cm and the 4th Vernier division coincides. Find the corrected diameter.
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Question

A Vernier callipers of least count 0.1 mm has positive zero error: with jaws closed, the 6th Vernier division coincides. While measuring a spherical bob, the Vernier zero lies between 3.2 cm and 3.3 cm and the 4th Vernier division coincides. Find the corrected diameter.

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G1 Physics · Accepted Answer

Vernier LC=0.1 mm=0.01 cm. Positive zero error =6×0.01=0.06 cm. Observed diameter =3.2+4×0.01=3.24 cm. Corrected diameter =3.24−0.06=3.18 cm. Correct answer: A.