A steel ball is floating in a trough of mercury. If we fill the empty part of the through with water, what will happen to the steel ball:

it will continue in its position

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it will move up

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it will move down

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it will execute vertical oscillations

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Solution

The correct option is B it will move up
The steel ball floats in the mercury because it's less dense than mercury. Here a part of it is in the mercury while a part is in water. due to the density of mercury, it floats on it as it gets some upthrust and when water is poured over the setup, then it gets some additional upthrust from water too. Due to this the steel ball gets raised to some extent however it's not floated in the water due to its density.

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