Suppose the pressure at the surface of m...

Suppose the pressure at the surface of mercury in as barometer tube is `P_1` and the pressure at the surface of mercury in the cup is `P_2`.

`P_1=0, P_2=` atgmospheric pressure

`P_1`= atmosphereic pressure `P_2=0`

`P_1=P_2=`atmospheric pressure

`P_1=P_2=0`

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