Question

What is the sign of conductivity?

Answer 1

Hint: Every electronic device we use has a channel that allows current to flow through it. In addition, electric conductivity is a measure of a conductor's capacity to conduct electricity. Furthermore, in this question, you will learn about the definition of conductivity, the sign of conductivity, its formula.

Complete answer:
The reciprocal of electrical resistivity is electrical conductivity.
Electrical conductivity is commonly represented by the Greek letter $\sigma $(sigma), but other symbols such as$\gamma $ (gamma) and$\kappa $ (kappa) are also used.

Additional information:
Conductivity:
The measure of how an electric current journey within a substance is referred to as its conductivity. Furthermore, the higher the current density for a given applied potential difference, the greater the electrical conductivity within the material.
In layman's terms, electrical conductivity is a substance's capacity to conduct electricity. Also, the electrical conductance or conductivity of a material is crucial since some substances must conduct electricity while others do not.
For example, wire conductors must allow current to flow as freely as feasible. While other minerals, like the resistor, are necessary to regulate the passage of current.
Other materials, on the other hand, such as insulators, are not necessary to carry electricity.
The formula for conductivity:
The resistivity formula is the inverse of the conductivity formula.
$\sigma = \dfrac{1}{\rho }$
Here,
$\sigma $-Electrical conductivity
$\rho $- resistivity

Note: A material's conductivity fluctuates with temperature, but it can also vary depending on the strength of an applied magnetic field. So far, we've assumed that all materials are homogeneous and isotropic; homogeneous means that a material's properties are the same regardless of where a sample is collected, and isotropic means that these qualities have the same value regardless of which direction they are measured in. However, this is not always the case, specifically in the case of semiconductors, which found the most suitable materials with varying conductivities in different directions. Furthermore, conductance and resistance should not be confused with conductivity and resistivity. Although they are related, they are not the same and cannot interchange. Conductance and resistance fluctuate with the size of the material, although conductivity and resistivity do not.