Title: chapter 2

Choose the correct statement.

- Ohm's Law states that the resistance is independent of the applied voltage. (correct)
- Ohm's Law states that the resistivity depends on the current density.

- In the Drude Model we assume that the electrons are classical particles and that they do not interact with each other either through collisions or by charges. They only interact with ions by collisons like billiard balls. (correct)
- In the Drude Model the electrons are treated like classical particles, which do not interact with each other by charges. They can only interact by collisons between each other or with the positive ions like billiard balls.

- The thermal velocity of classical particles can be described by classical thermodynamics. It does not show a preferred direction and can therefore not be added to the electrical velocity. (correct)
- Using classical thermodynamics we can define the thermal velocity of classical particles, which is then added to the electrical velocity to get the total velocity of the electrons.

- Classical free electron theory predicts ohmic behavior! The thermal velocity is linearly proportional to the electrical field, and therefore we know that the conductivity is a constant value. (correct)
- Ohmic behavior cannot be explained by classical free electron theory! The thermal velocity is dependent of the electrical field, which contrdicts Ohm's law.

- The Hall effect (correct)