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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