Hello! Yes I know this is a lot but let me explain. this is one question I promise. so the text at the top is the problem. I attempted it by myself. I believe I got A correct, so reassurance on that would be great. but when it comes to B and C, I don't know where to put the numbers as a plug in. please help me.

Explain what happens at the saturation point when adding salt to water at room temperature.

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather

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.