Suppose the pressure at the surface of mercury in a barometer tube is P_(1) and the pressure at the surface of mercury in the cup is P_(2).

Suppose the pressure at the surface of mercury in a barometer tube is

1.	Suppose the pressure at the surface of mercury in a barometer tube is P_(1) and the pressure at the surface of mercury in the cup is P_(2).
Answer» `P_(1)=0,P_(2)=0` atmospheric PRESSURE `P_(1)=` atmospheric pressure `P_(2)=0` `P_(1)=P_(2)=` atmospheric pressure `P_(1)=P_(2)=0` ANSWER :A