In a hydrogen atom in its ground state, the electron is on average a distance of about 1×10-10 m from the proton. what is the magnitude of the electric field due to the proton a distance of 0.9 ✕ 10-10 m away?

E=kQ/r^2 where k is Coulomb's constant
E=(9e9)(1.6e-19)/(1e-10)^2=
1.44e11N/C

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