Question

The correct sequence of increasing order of electrical resistivity of the given material is-

1. Gold, Silicon, Doped germanium, Diamond
2. Gold, Doped Germanium, Silicon, Diamond
3. Gold, Diamond, Doped germanium, Silicon
4. Diamond, Silicon, Gold, Doped germanium

Answer 1

Correct Answer - Option 2 : Gold, Doped Germanium, Silicon, Diamond

Concept:

Electrical resistivity is the reciprocal of electrical conductivity.

• Diamond is a good electrical insulator, having a resistivity of 100 GΩ·m to 1 EΩ·m (10¹¹ to 10¹⁸ Ω·m)
• Silicon and Germanium are semiconductor material with standard resistivity’s at room temperature is as shown
  • Silicon - 2.3 x 10⁷  Ω·m
  • Germanium – 4.7× 10³ Ω·m
  • The resistivity of silicon is more than the germanium, also when germanium is dopped its resistivity further decreases, as the dopant atoms increase the conductivity of the material.
• Gold is a good conductor with high electrical conductivity and low electrical resistivity (0.022 micro-ohm m)

 

The sequence of increasing order of electrical resistivity:

Gold < Doped Germanium < Silicon < Diamond