Question

obtain the macroscopic form of ohm's law from its microscopic form and discuss its limitation.​

Answer 1

Answer:

When electric current in a material is proportional to the voltage across it, the material is said to be "ohmic", or to obey Ohm's law. A microscopic view suggests that this proportionality comes from the fact that an applied electric field superimposes a small drift velocity on the free electrons in a metal.