Un objet se trouvant à une distance r= 9016,226 km du centre de la Terre subit une accélération gravitationnelle de 4,9 m/s2. Si cet objet décrit une orbite
circulaire autour de la Terre, quelle est sa vitesse?

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.