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For dielectrics in alternating field, polarizability ae is a complex quantity. The imaginary part of ae is zero for

ω = 0
ω → ∞
ω = 0 and ω → ∞
ω = natural frequency ω0

Correct Answer: ω = 0 and ω → ∞

Explanation:

Imaginary part of a_e is zero for ω = 0 and ω = ∞.

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