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Q.

The area of cross-section of the two arms of a hydraulic press are 1 cm2 and 10 cm2 respectively (fig.). A force of 5 N is applied on the water in the thinner arm. The force should be applied on the water in the thicker arm so that the water may remain in equilibrium _____________ N

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answer is 50.

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Detailed Solution

According to Pascal's law, the pressure at the same height, or A and B, must be equal for the water to remain in equilibrium.

From the question

PA=PBFAAA=FBABFB=FAAA×AB 

FB=5×101=50N

Hence the correct answer is 50N.

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