Acurrent density of 7.00 10-13 a/m2 exists in the atmosphere at a location where the electric field is 185 v/m. calculate the electrical conductivity of the earth's atmosphere in this region.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.