Some miners wish to remove water from a mine shaft. A pipe is lowered to the water 90 m below, and a negative pressure is applie
d to raise the water. (a) Calculate the pressure needed to raise the water. (b) What is unreasonable about this pressure? (c) What is unreasonable about the premise?
Parallel-plate capacitor has there fore formula is
<span>C=(<span>ϵ0</span>A)/d putting values</span>C=(8.85*10^-12*pi*.05^2)/.00063 =1.1*10^-10F
then Q=CV=1.1*10^-10*1000=1.1*10^-7C as <span>η=Q/A</span><span>therefore (1.1*10^-7)/(pi*.05^2) =1.4*10^-5C/m^ our answer hope this helps</span>