The electric field in a certain region of Earth's atmosphere is directed vertically down. At an altitude of 426 m the field has magnitude 47.0 N/C; at an altitude of 283 m, the magnitude is 114 N/C. Find the net amount of charge contained in a cube 143 m on edge, with horizontal faces at altitudes of 283 m and 426 m.

There is a naturally occurring vertical electric field near the Earth's surface that points toward the ground. In fair weather conditions, in an open field, the strength of this electric field is 80.0 N/C. A spherical pollen grain with a radius of 13.0 µm is released from its parent plant by a light breeze, giving it a net charge of -0.500 fC (where 1 fC = 1 × 10-¹5 C). What is the ratio of the magnitudes of the electric force to the gravitational force, Felectric/Fgrav, acting on the pollen? Pollen is primarily water, so assume that its volume mass density is 1000 kg/m³, identical to the volume mass density of water. Felectric Fgrav

Consider two oppositely charged, parallel metal plates. The plates are square with sides of 58 cm and carry charges 74 μC and -74 μC. What is the magnitude of the electric field (in N/C) in the region between the plates?

Two conductive spheres with radii of 0.94 m and 0.47 m are connected to each other by a conductive wire. If the electric field on the surface of the small sphere is 890 N/C, find the total charge on the large sphere, initially considered uncharged