A hollow sphere has a small hole in it. ...

A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of `40 cm` below the surface. Surface tension of water is `7 xx 10^(-2) N//m`. The diameter of the hole is

(`1//28)mm`

`(1//7)mm`

`(1//14)mm`

`(7//21)mm`

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