12.7 Conductivity or Specific Conductance (s)

The inverse of resistivity is called conductivity or specific conductance,

s =

Its SI unit is S m-1 or W-1m-1.

. For a conductor, the current density is directly proportional to applied electric field,

J µ E

or J = sE

where the constant s is the conductivity. But we know that

J = nemE

\s = nem

and r =

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