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Q.

20 N force is applied to the massless piston of area A1 as shown.  What force F must be applied to massless piston of area A2 if the level of water in both the tubes is at the same horizontal level.

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a

50 N

b

100 N

c

200 N

d

300 N

answer is B.

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Detailed Solution

Given Applied force F=20 N Area of Piston=A1 Area of Piston=A2 Applying Pascal's law F1A1=F2A2 ⇒20cos60A1=FA2 ⇒102=F20 ⇒F=100 N
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