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There is a small mercury drop of radius ...

There is a small mercury drop of radius `4.0mm`. A surface P of area `1.0 mm^(2)` is placed at the top of the drop. Atmospheric pressure `= 10^(5) Pa`. Surface tension of mercury `= 0.465 N//m`. Gravity effect is negligible.
The force exerted by mercury drop on the surface P is

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