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Question

The pressure P1 at the top a dam and P2 at a depth h from the top inside water are related as:


A

P1 > P2

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B

P1 = P2

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C

P1 - P2 = hρg

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D

P2 - P1 = hρg

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Solution

The correct option is D

P2 - P1 = hρg


Pressure at a point in a liquid is due to the weight of the liquid acting on the surface of any objects in the liquid.

P = ρgh

Therefore pressure acting at a distance h = pressure exerted by the water column above the point = P2 - P1 = hρg


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