Question

Two wires A and B are made of copper. Both wires are 1m long. Wire A is 1mm thick and wire B is 2mm thick. Which wire has more resistivity.

Answer 1

The electrical resistivity of a material is an intrinsic property that does not have a dimensional dependence. The resistivity of a material conductor does not depend on conductor thickness. Another example of an intrinsic property would be the density of a material. The density of water remains the same regardless of how much you have.

The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.

A good conductor has less resistivity, whereas a bad conductor or insulator has high resistivity. The resistivity of semi-conductors lies between that of conductors and insulators.

The resistivity of a metallic conductor increases with an increase in its temperature, whereas the resistivity of a semi-conductor decreases with an increase in its temperature.