what's the unit of electrical conductivity?
Answers
Answer:
Hope this answer help you
Answer:
Explanation:
First of all, it is necessary to know the specific resistance(resistivity).
Resistivity or a specific resistance of a material is a measure of the resistance, which it provides to the flow of current through it: specific resistance depends upon composition, temperature, pressure of the material. The reciprocal of resistivity is defined as specific conductance which is the ability to conduct electricity.
When electric current is passed through metallic rod of same cross-section then resistance of rod (R) is directly proportional to length of rod (L) and inversely proportional to the area of cross-section (A) of it.
⇒ R∝LA
⇒R=ρLA
ρ= it is a constant which is called specific resistance of conductor.m2This constant has different value for different materials as we know specific resistance is dependent on the physical properties of material like density and composition. For unit length and unit cross-sectional area, i.e., L=1cm and A=1cm2,ρ=r
Specific resistivity is reciprocal to specific conduct σ=ohm−1×cmcm2Ωwhich is donated by σ.
From the specific resistance formula,
ρ=unit of R×unit of Aunit of L
When resistance R is expressed in Ω, area (A), and length (L) are in m.
Unit of specific conductance can be determined as we know conductivity is the reciprocal of resistivity so,
Unit of resistivity is ohm−1m−1.
So, the correct answer is option (B).