S.I. unit of specific resistance is

Options

A. ohm m
B. `ohm m ^(-1)`
C. `ohm m ^(2)`
D. `(ohm) ^(-1)`

Answer

A

Explanation

`R = rho L/A`
`rho` is specific resistance whose SI unit is `Omegam.` Reciprocal of resistivity of specific resistance is conductivity or specific conductance.
`therefore SI` unit of conductivity is `(Omega m)^(-1) or Omega ^(-1) m ^(-1) or Sm ^(-2).`