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A hollow shpere has a smalll hole. When ...

A hollow shpere has a smalll hole. When the sphere is taken to a depth of 0.5 m inside water the air bubble start coming out from the hole. If the surface tension of water is `70xx10^-3 N//m`, the radius of the hole is

A

`2.8xx10^-5m`

B

`1.35xx10^-5m`

C

`0.67xx10^-5m`

D

`0.28xx10^-5 m`

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