Explain what is meant by screening of electrical potentials. Explain the difference between the screening properties of

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Explain what is meant by screening of electrical potentials. Explain the difference between the screening properties of metals and insulators. If in a solid the density of states at the Fermi level gv(EF) is 1026/m3eV, what is the screening length? If we lower the temperature and the solid turns into an insulator or wide bandgap semiconductor, what happens to the screening length?

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