First slide

Conductors, semi conductors and insulators

Question

Which one of the following is a semiconductor

Difficult

A

CuO
B

Ag
C

Graphite
D

Teflon

Solution

$Conducvity values (S m^{- 1}); Ag - 6.2 \times 10^{3} - conductor Graphite - 120 - conductor CuO - 10^{- 7} - semi conductor Teflon - 10^{- 18} - insulator$

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