It turns out that the Earth generates a natural electric field. Near the surface of the Earth, that electric field has a magnitude of about 100 N/C and points downward.

To estimate the net charge of the Earth, let's use an approximation: imagine that all the charge is concentrated right at the center of the Earth. Given that assumption, what is the net charge of the Earth (note that the radius of the Earth is about 6.37×10 ⁶ m)?