Assertion: Pascal law is the working principle of hydraulic lift.
Reason: Pressure `=(thrust)/(area)`

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

B

Explanation

According to Pascal.s law, if gravity effect is neglected, the pressure at every point of liquid in equilibrium of rest is same.
`P_1 = P_2`
i.e. `(F_1)/(a_1)=(F_2)/(a_2)`
or `F_2=(a_2)/(a_1)F_1`
As `a_2 gt gt a_1 :. F_2 gt gt F_1`

This shows that small force (`F_1`) applied on the smaller piston (of area `a_1`) will be appearing as a very large force on the larger piston.