What is the reciprocal of conductivity?

The reciprocal of conductivity is resistivity, making this the correct answer. Conductivity is a measure of a material's ability to conduct electric current, and it is defined as the inverse of resistivity. Resistivity quantifies how strongly a material opposes the flow of electric current; therefore, if a material has high conductivity, it will have low resistivity, and vice versa.

Understanding these concepts is crucial in electronics because they help in analyzing and designing circuits. For instance, materials with low resistivity are typically used in wiring and components where minimal resistance is desired to ensure efficient current flow. This relationship between conductivity and resistivity plays a vital role in selecting materials for various electrical applications and ensuring circuits function as intended.