The main scale of a vernier caliper has ten equal parts per cm. Ten vernier divisions coincide with eight main-scale divisions. If the least count is 2×10⁻ⁿ cm, find n.
Physics · Mixed Chapter
JEE Main Practice

Question

The main scale of a vernier caliper has ten equal parts per cm. Ten vernier divisions coincide with eight main-scale divisions. If the least count is 2×10⁻ⁿ cm, find n.

G1 Physics · Accepted Answer

Step 1: One main-scale division = 1 cm/10 = 0.1 cm. Step 2: One vernier division = 8×0.1/10 = 0.08 cm. Step 3: Least count = 0.1−0.08 = 0.02 cm = 2×10⁻² cm. Step 4: Thus n = 2.