What are the thermal boundary conditions for polypropylene (PPP) or polyvinyl chloride (PVC) cylinder in Lab 6?a. Constant temperature at the inner surface, b. constant temperature at the outer surfaceConstant temperature at the inner surface, c. zero temperature gradient at the outer surfaceUniform heat flux at the inner surface, d. constant temperature at the outer surfaceUniform heat flux at the inner surface, e. zero temperature gradient at the outer surface

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.