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In experiment for measuring surface tens...

In experiment for measuring surface tension by capillary rise method, reading or positions `A`, `B`, `C` and `D` for internal diameter of capillary tube are given as under
`A(cm)=1.006`
`B(cm)=1.009`
`C(cm)=1.004`
`D(cm)=1.009`

Mean intenal radius of capillary is

A

`0.002cm`

B

`0.003cm`

C

`0.004cm`

D

`0.005cm`

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The correct Answer is:
A
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