Assume there's a hydrogen atom. Its proton(charge +e) is at the center of a spherical electron cloud(-e) which radius is 10Å and the electrons are uniformly distributed at the sphere's surface. If we now put it into a uniform electric field [tex]E_0[/tex], what is the distance [tex] \delta [/tex] between the proton and the center of the spherical electric cloud. This a problem of an college enterance exam(physics department) and I'm only a high school student. I have no idea about this. Moreover, I thought if we put the atom into a electric field, the electric cloud will be distorted and will no longer be a spherical. But why the problem ask the distance between the proton and the center of the spherical Plz Help Me! thank you very much!