12. When an external electric feld is applied to a dielecttic,
(A)the electric dipoles align antiparallel to the external feld, the eloctric feld in the interiorbecomes smaller than external electric field,
(B) the electric dipoles align parallel to the external field, the electric field in the interiorbecomes smaller than external electric feld,
(C) the electric dipoles align antiparallel to the external feld, the electric feld in the interiorbecomes greater than external electtic feld,
(D) the electric dipoles align parallel to the external feld, the electric field in the interiorbecomes greater than external electric field,
(E) none of the above.