At noon, ship a is 130 km west of ship b. ship a is sailing east at 30 km/h and ship b is sailing north at 15 km/h. how fast is the distance between the ships changing at 4: 00 pm?

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.