Question

Insulators are materials having an electrical conductivity equal to:

• A. Between ${10}^{-8}$ S/cm to ${10}^3$ S/cm
• B. $<{10}^{-8}$ S/cm
• C. Equal to ${10}^3$ S/cm
• D. $>{10}^3$ S/cm

Answer 1

The correct option is B $<{10}^{-8}$ S/cm

Insulators are the least conducting materials and hence have the least conductivity or the highest resistivity. Therefore, they have a conductivity of $<{10}^{-8}$ $S/cm$.

Conductors have the highest conductivity i.e. $>{10}^3$ $S/cm$ whereas semiconductors have an electrical conductivity in between ${10}^{-8}$ and ${10}^3$ $S/cm$.