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A student measured the diameter of a sma...

A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of - 0.004 cm, the correct diameter of the ball is

A

`0.529 cm`

B

`0.521 cm`

C

`0.053 cm`

D

`0.525 cm`

Text Solution

Verified by Experts

[measurement of diameter of steel ball]= [ measurement on main scale] +[ measurement on vernier scale]+zero error
`=(0.5+25xx0.001+0.004) cm`
`=(0.5+0.025+0.004) cm`
`:.` Diameter `=0.5289 cm`
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