This diagram shows a thin slice of semiconductor material carrying a current in a magnetic field at right angles to the current.

a. The current in the slice is due to the movement of free electrons.
i. Add + and − signs to the diagram to show the charge separation caused by the Hall effect. Explain why the charges separate.
ii. Explain how an electron can eventually move in a straight line along the slice.
b. The Hall voltage is measured using the same slice of semiconductor, the same current and the same magnetic field, but with the laboratory at two temperatures, one significantly higher than the other.
Describe and explain the changes in the magnitude of the number density, the drift velocity of the charge carriers and the Hall voltage in the two experiments.

Transcribed Image Text:

magnetic field current Figure 25.18