A solid is completely immersed in a liquid. The force exerted by the liquid on the solid will
(a) increase if it is pushed deeper inside the liquid
(b) change if its orientation is changed
(c) decrease if it is taken partially out of the liquid
(d) be in the vertically upward direction.
Answers
Answer ⇒ Option (c). and (d).
Explanation ⇒ When an solid is completely immersed in an liquid, then the force exerted by the liquid will be equal to the weight of the liquid displaced.
Now, if we push it down, then the weight of the liquid displaced by it will not be affected (Hence, option (a). is incorrect. ), or either we change its orienttaion, then also it will not be affected. (Hence, option (b). is incorrect.)
If we will take out the solid from water, then volume of solid submerged is affected, hence, weight of the liquid is also affected. When we taker out solid, then weight displaced decreases, hence force by the liquid also decreases. Hence, option (c). is correct.
The weight of the liquid acts downward, thus force by the liquid (or upthrust) acts upward to balance this. Hence, option (d). is correct.
Hope it helps.