When we are applying force on a particular area, if the area is doubled, the net force acting remains same but the force acting on per unit area deacreases by its half.
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Force acting per unit area>>>pressure 
Hi there,
nothing happens to the force when area is doubled,but if area is doubled  the  pressure decreases as pressure=force/area.pressure is inversely proportional to area .
i hope this helps u...
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