If W be the weight of the body and U be the upthrust force of the liquid on the body then what happens if W=U

Body sinks in the liquid

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body floats just completely immersed

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body floats just partly immersed

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None

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Solution

The correct option is B body floats just completely immersed
Apparent weight of the body $W^{'} = W - U$
$∴$ $W = U$ $⟹ W^{'} = 0$
Thus the body floats just completely immersed.

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A body is held immersed in a liquid.

(i) Name the two forces acting on the body and draw a diagram to show these forces.

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(iii) What is the net force on the body if it (a) sinks, (b) floats?

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