The correct option is
C,Sm−1.
Electrical conductivity is a measure of the ability of a material to conduct electric current. The
SI unit of electrical conductivity is the siemens per meter
(Sm−1. ). It is the inverse of electrical resistivity (with resistivity measured in ohm-meters,
Ωm ), and thus conductivity is expressed as the reciprocal of resistivity. Therefore, the formula to calculate conductivity
(σ) from resistivity
(ρ) is:
σ=So, when resistivity is in
Ωm, conductivity is given in
Sm−1, making option
C the correct answer. The other units mentioned are related to electrical terms but do not correctly represent the unit of electrical conductivity:
Option A: "S
m " is not properly formatted; it lacks the exponent to denote per meter.
Option
B:Ωm is the unit of electrical resistivity, not conductivity.
Option
D:Ωm−1 is not a standard unit for any electrical property.