4. A lamp is connected to a 230 V mains supply. A current of 4 A flows through the lamp for 30 seconds.
4.1 Write down the equation that links charge flow, current, and time. (1 mark)

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.