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Question
Assertion :If an object is submerged in fluid at rest, the fluid exerts a force on its surface. Reason: The force exerted by the fluid at rest has to be parallel to the surface in contact with it.
Assertion :If an object is submerged in fluid at rest, the fluid exerts a force on its surface. Reason: The force exerted by the fluid at rest has to be parallel to the surface in contact with it.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
When an object is submerged in a fluid at rest, the fluid exerts a force on its surface. This force always normal to the object's surface. This is because if there were a component of force parallel to the surface, then the object will also exert force on the fluid parallel to it as a consequence of Newton's third law. This will cause the fluid to flow parallel to the surface. Since the fluid is at rest, therefore, it cannot happen. Hence, the force exerted by the fluid has to be perpendicular to the surface.So the assertion is correct and the reason is incorrect
When an object is submerged in a fluid at rest, the fluid exerts a force on its surface. This force always normal to the object's surface. This is because if there were a component of force parallel to the surface, then the object will also exert force on the fluid parallel to it as a consequence of Newton's third law. This will cause the fluid to flow parallel to the surface. Since the fluid is at rest, therefore, it cannot happen. Hence, the force exerted by the fluid has to be perpendicular to the surface.
So the assertion is correct and the reason is incorrect
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