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Define the term electrical conductivity ...

Define the term electrical conductivity of a metallic wire. Write its SI unit.

Text Solution

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The reciprocal of the resistivity of a material is called its conductivity and is denoted by `sigma`
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Define electrical conductivity of a metallic wire. Write its SI unit.

(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.

Knowledge Check

  • S.I unit of thermal conductivity is

    A
    `J s m^(-1) K^(-1)`
    B
    `J s^(-1) m^(-1) K^(-1)`
    C
    `Js^(-1) m^(-2) K`,
    D
    `Js^(-1) m^(-1)K.`

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