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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

A

`(1)/( 28)mm`

B

`(1)/( 21)mm`

C

`(1)/( 14) mm`

D

`(1)/( 7)mm`

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