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If water rises in a capillary tube upto ...

If water rises in a capillary tube upto 3 cm . What is the diameter of capillary tube (Surface tension of water `= 7.2 xx 10^(-2) N//m`)

A

`9.6 xx 10^(-4)m`

B

`9.6 xx 10^(-3)m`

C

`9.6 xx 10^(-2)m`

D

`9.6 xx 10^(-1)m`

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A
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