Electrical conductivity of insulators is

  • A
    extremely small.
  • B
    exactly zero.
  • C
    sometimes small and sometimes large.
  • D
    extremely large.

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Similar Questions

$C$, $Si$ and $Ge$ have the same lattice structure. Why is $C$ an insulator while $Si$ and $Ge$ are intrinsic semiconductors?

Give an explanation of energy band,valence band,and conduction band in a crystal.

$A$ piece of copper and another of germanium are cooled from room temperature to $80\, K$. The resistance of :-

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