Una caja de madera se desliza a velocidad constante sobre una mesa de trabajo; si la caja tiene una masa de 15Kg. y el coeficiente de fricción es de 0.2. Determina el valor de la fuerza que se le aplica a la caja de madera.

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.