The lower end of a capillary tube is at a depth of \( 12 \mathrm{~cm} \) and water rises \( 3 \m...

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The lower end of a capillary tube is at a depth of \( 12 \mathrm{~cm} \) and water rises \( 3 \mathrm{~cm} \) in it. The mouth pressure required to blow
P an air bubble at the lower end will be \( x \mathrm{~cm} \) of water column,

W where \( x \) is
(1) 12
(2) 15
(3) 3
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