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A ball is made of a material of density ρ, where ρoil < ρ < ρwater with ρoil and ρwater represent the densities of oil and water respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, the figure which represents the equilibrium position is :

    1.
A ball is made of a material of density ρ, where ρ<sub>oil</sub> < ρ < ρ<sub>water</sub> with ρ<sub>oil</sub> and ρ<sub>water</sub> represent the densities of oil and water respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, the figure which represents the equilibrium position is : Concise Physics Solutions ICSE Class 9.
    2.
A ball is made of a material of density ρ, where ρ<sub>oil</sub> < ρ < ρ<sub>water</sub> with ρ<sub>oil</sub> and ρ<sub>water</sub> represent the densities of oil and water respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, the figure which represents the equilibrium position is : Concise Physics Solutions ICSE Class 9.
    3.
A ball is made of a material of density ρ, where ρ<sub>oil</sub> < ρ < ρ<sub>water</sub> with ρ<sub>oil</sub> and ρ<sub>water</sub> represent the densities of oil and water respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, the figure which represents the equilibrium position is : Concise Physics Solutions ICSE Class 9.
    4.
A ball is made of a material of density ρ, where ρ<sub>oil</sub> < ρ < ρ<sub>water</sub> with ρ<sub>oil</sub> and ρ<sub>water</sub> represent the densities of oil and water respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, the figure which represents the equilibrium position is : Concise Physics Solutions ICSE Class 9.

Fluids Upthrust

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Answer

A ball is made of a material of density ρ, where ρ<sub>oil</sub> < ρ < ρ<sub>water</sub> with ρ<sub>oil</sub> and ρ<sub>water</sub> represent the densities of oil and water respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, the figure which represents the equilibrium position is : Concise Physics Solutions ICSE Class 9.

option 2

Reason —

Given,

Density of oil : ρoil

Density of ball : ρ

Density of water : ρwater

And the relation : ρoil < ρ < ρwater

This means :

(a) The ball is denser than oil, so it will sink in oil.

(b) The ball is less dense than water, so it will float in water.

Since oil and water are immiscible, they form two distinct layers — oil on top and water below. So, the ball will sink through the oil (because it is denser than oil) and partially float in the water (since it is less dense than water).

Therefore, it will come to rest at the oil-water interface, partially submerged in both fluids.

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