1. Concept: When placed in an external electric field, the atoms inside a dielectric shift. Positive nuclei pull slightly one way, electron clouds the other. This creates a weak 'internal' field pointing backward, fighting the main field.
2. Formula: $$ E_{net} = E_{external} - E_{internal} $$
3. Solution: - Because the newly created internal polarization field acts in direct opposition to the primary external field, their vector sum forces the overall net electric intensity inside the material to actively decrease.
4. Why other options are incorrect: It does not become fully zero (Option D) unless the material is a perfect conductor that shifts free electrons until total cancellation occurs. Dielectrics only partially cancel the field.
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