Option 2 : Conductance

Option **2** is correct, i.e. **Conductance.**

__Conductance:__

- The degree to which an object conducts electricity, calculated as the ratio of the current which flows to the potential difference present.
- This is the reciprocal of the resistance and is measured in siemens or mhos.

__Note:__

__Conductivity:__

- Electrical conductivity is the measure of the amount of electrical current a material can carry or its ability to carry a current.
- It is also known as specific conductance.
- It is an intrinsic property of a material.
- It is denoted by the symbol σ and has SI units of Siemens per meter (S/m).

__Resistivity (__ρ)__:__

- Resistivity is the resistance per unit length and cross-sectional area.
- It is the property of the material that opposes the flow of charge or the flow of electric current.
- The unit of resistivity is ohm meter.
- A material with high resistivity means it has got high resistance and will resist the flow of electrons.
- A material with low resistivity means it has low resistance and thus the electrons flow smoothly through the material.
- It depends on the material of the conductor but not on its dimensions. ρ is called resistivity.

__Resistance:__

- It is defined as the hurdles in the path of flow of current.
- The SI unit of resistance is the ohm.
- It is denoted by the symbol Ω.
- It depends on the material of the conductor and the dimensions of the conductor.
- In other words, we can say it is the ratio of voltage to the current.
- R= (rho×length)/area
- Note: rho=Resistivity.