In the simple bohr model of the eighth excited state of the hydrogen atom, the electron travels in a circular orbit around a fixed proton. the radius of the orbit is 4.28 ✕ 10−9 m, and the speed of the electron is 2.43 ✕ 105 m/s. the mass of an electron is 9.11 ✕ 10−31 kg. what is the force on the electron (in n)? (enter the magnitude.)