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MHT CET202616 April 2026Evening ShiftPhysicsSemiconductorsActual

Electrical conductivity of insulators is

Options

  1. Aexactly zero
  2. Bextremely large
  3. Cextremely small
  4. Dsometimes small and sometimes large

Correct answer

C. extremely small

Step-by-step solution

Insulators are materials that offer very high resistance to the flow of electric current. Their energy band gap is very large (typically greater than 3 eV ), which means there are almost no free electrons available for conduction at room temperature. As a result, the electrical conductivity of insulators is not exactly zero but is extremely small, typically in the range of 10⁻²⁰ to 10⁻¹⁰ , ⁻¹ m ⁻¹ . Answer: extremely small

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