Question

The upthrust is maximum (= FB) when the body is:
(a) floating in the liquid
(b) completely immersed inside the liquid
(c) partially immersed inside the liquid
(d) None of these

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Answer

(b) completely immersed inside the liquid

Reason —

As FB = volume of submerged part of body × density of liquid × g

Hence, FB will be maximum when the body is completely immersed inside the liquid.

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