In given figure, if the pressure of gas in bulb A is 50

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In given figure, if the pressure of gas in bulb A is 50 cm Hg vacuum and p_atm = 76 cm Hg, then height of column H is equal to

1. 26 cm
2. 50 cm
3. 76 cm
4. 126 cm

Correct Option: B

p_A = 50 cm Hg vacuum = p_H