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Q.

The area of cross-section of the wider tube shown in the figure is 800 cm2. If a mass of 12 kg is placed on the massless piston, the difference in heights h in the level of water in the two tubes is

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a

6 cm 

b

10 cm

c

15 cm 

d

2 cm

answer is C.

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Detailed Solution

hρg=mgA;h=mgAρg=mρA

=121000×800×10−4=0.15m=15cm

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