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Materials are classified as conductors, insulators and:

ASuperconductors
BSemicircuits
CSupercircuits
DSemiconductors
Answer & Solution
Correct answer: D. Semiconductors
1. The classification is by resistivity in increasing order. 2. One class sits between the other two. 3. Materials are classified as conductors, semiconductors and insulators depending on their resistivities. 4. So the answer is semiconductors. _Source: syllabus Physics, Ch 3 'Current Electricity'_
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