Answer :

(a) 0.1 N

(b) 0.10023 N


(c) 0.00023 N


Given, area of the small region,


Atmospheric pressure,


Surface tension of mercury,


(a) Force exerted by air above it is


(b) Pressure from inside the drop,


Total pressure=


Total force,


(c)Here, only the pressure from mercury bubble is to be considered.


Total force,


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