Apiston above a liquid in a closed container has an area of 1m2. the piston carries a load of 350 kg. what will be the external pressure on the upper surface of the liquid?

a. 27.3 kpa
b. 3.43 kpa
c. 4.90 kpa
d. 68.6 kpa

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e