he first law of thermodynamics states that the change U in the internal energy of a system is given by U = Q+W, where Q is the heat, and W is the work. Both Q and W can be positive or negative numbers. Q is a positive number and W is a positive number if .

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.