Q.

A rectangular glass plate is held vertically with long side horizontal and half the plate immersed in water. Which of the following forces is acting on the plate? 

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a

All of these

b

Force of viscosity acting horizontally

c

Force of surface tension acting vertically downwards

d

Weight of the plate acting vertically upwards

answer is B.

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Detailed Solution

The various forces acting on the plate are,

(i) Weight of the plate acting vertically downward 

(ii) Surface tension acting vertically downwards 

(iii) Upthrust due to liquid acting vertically upward

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