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Conductivity of a material is highest in:

ASemiconductor
BVacuum
CInsulator
DMetal (conductor)
Answer & Solution
Correct answer: D. Metal (conductor)
Metals have very high conductivity (~10⁷ S/m) due to free electrons. Semiconductors are intermediate (10⁻⁴ to 10⁴ S/m), insulators very low (<10⁻⁸ S/m).
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