Consider an electric field perpendicular to a table top. When a small charged sphere of mass 3.98 g and charge 16.4 C is carefully placed

 Consider an electric field perpendicular to a table top. When a small charged sphere of mass 3.98 g and charge −16.4 µC is carefully placed in the field, the sphere is in static equilibrium. What are the magnitude and direction of the electric field? (Give the magnitude in N/C.)