Electrical field = 150 directed everywhere downward near Earth's surface. 1. What is the net electric charge on the Earth? Earth is a spherical conductor of radius 6371. km. 2. What is the electrostatic potential at the Earth’s surface, if the potential is taken to be zero at infinity? 3. Using above info from Problem 1 Calculate the acceleration—magnitude and direction—of a proton released near the surface of the Earth. Disregard any interaction with air molecules. 4. Calculate the charge-to-mass ratio of a particle which would hover in place if released near the surface of the Earth. Part one and two I did can you check if its right? 1. q= Er^2 / k = -6.774*10^5 C 2. V= kq/r = -9.55*10^8 V No idea about part three and four??? Thanks!