State whether upthrust will increase or decrease if the volume of a solid increases.

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Solution

When an object is partially or wholly immersed in a fluid, an upward thrust acts on it.
This upward thrust is directly proportional to the volume of the body immersed in the fluid.
Upthrust by a liquid on an object is calculated as -
$U p t h r u s t = V o l u m e o f t h e o b j e c t \times d e n s i t y o f t h e l i q u i d \times g r a v i t a t i o n a l a c c e l e r a t i o n$
Hence, if the volume of the solid increases then the upthrust also increases.

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