An open glass tube is immersed in mercury in such a way that a length of \( 8 \mathrm{~cm} \) ex...

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An open glass tube is immersed in mercury in such a way that a length of \( 8 \mathrm{~cm} \) extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional \( 46 \mathrm{~cm} \). What will be length of the air column above mercury in the tube now
(Atmospheric pressure \( =76 \mathrm{~cm} \) of \( \mathrm{Hg} \) ) [JEE (Mains) 2014]
(a) \( 16 \mathrm{~cm} \)
(b) \( 22 \mathrm{~cm} \)
(c) \( 38 \mathrm{~cm} \)
(d) \( 6 \mathrm{~cm} \)
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