The interstitial diffusion rates of C in BCC iron at 500°C and 1000°C are 10-12 and 2 × 10-9 m2s-1, respectively. What is the diffusion rate at 0°C?

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.