Which of the following questions could best be answered by the work of Charles Kuen Kao?
A. How are mirrors used inside a camera?
B. How quickly are stars in the Milky Way moving away from Earth?
C. What is the best way to deliver broadband Internet service to rural
areas?
D. How will climate change affect the strength of hurricanes in the
future?

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.