A vernier callipers has 9 main scale divisions equal to 10 vernier divisions, with 1 main scale division =1 mm. The main scale reading is 10 mm and the 8th vernier division coincides. If the callipers has a positive zero error of 0.04 cm, the radius of the bob is × 10⁻² cm.

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52. L.C. =(1 mm)/(10)=0.01 cm. Observed diameter =10 mm+8×0.1 mm=10.8 mm=1.08 cm. Corrected diameter =1.08-0.04=1.04 cm; radius =0.52 cm=52×10⁻² cm.

A vernier callipers has 9 main scale divisions equal to 10 vernier divisions, with 1 main scale division =1 mm. The main scale reading is 10 mm and the 8th vernier division coincides. If the callipers has a positive zero error of 0.04 cm, the radius of the bob is ______ × 10⁻² cm.

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