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The lectures are uploaded as pdf files, so you will need Adobe Acrobat Reader in order to read them. Lecture 2 - Hall effect, a.c. conductivity.Hall effect experiment is made in a sample of a flat semiconductor of length 1 cm and width 0.3 cm. The mobility of carriers in the sample is 4500 cm /V-s. In this experiment, the Hall Effect will be used to study some of the physics of charge transport in metal and semiconductor samples. Drift velocity and mobility. Hall effect in semiconductors. Electrons and Holes. We have seen that the charge carriers in metals are electrons which are in Introduction to Drude's free electron theory of metals, electrical conductivity Ohm's law and Hall effect. Introduction to Drude's theory of electrons in a