Arigid, insulated tank contains steam at 3 mpa, 400 celsius. a valve on the tank is opened, allowing steam to escape. the overall process is irreversible, but the steam remaining inside the tank goes through a reversible adiabatic expansion. determine the fraction of steam that has escaped when the final state inside is saturated vapor.

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.