Question

20. (a) Define the term "conductivity' of a metallic wire. Write its SI unit.
(b) Using the concept of free electrons in a conductor, derive the expression
for the conductivity of a wire in terms of number density and relaxation
time. Hence obtain the relation between current density and the applied
electric field E.151​

Answer 1

Explanation:

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Answer 2

Answer:

a) The conductivity of a metallic wire is defined as it is the ability of the wire to allow the electric flow of electric charges as heat through it.

Numerically, the conductivity of a wire is defined as the reciprocal of resistivity.

That is, conductivity

α = 1/ρ

Explanation: