An atom of atomic number Z has a nuclear charge Ze and Z electrons
revolving around it. As a model of this atom, consider the nucleus as a point
charge and treat the electron cloud as a total charge- Ze distributed uniformly
throughout a sphere of radius ro. When an external field E is applied, the
nucleus is displaced an amount x. Show that a restoring force x(Ze)2/4Pir3oEo
is produced and must be equal to ZeE. Thus show that the induced dipole moment is p =4*Pi*E0r03E and is linearly related to E.
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