In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

It will increase.

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It will decrease.

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There will be no change in the reading.

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It can't be determined.

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Solution

The correct option is B
It will decrease.

When the block is immersed inside the water, the water will apply upthrust on the block. This upthrust will be in the upward direction and will be equal to the weight of the water displaced by the block. Hence, the block weighs less in water due to upthrust and the reading will decrease.

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In the given figure, if we immersed the block into the water then what will happen to the reading on the spring balance?

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