Question

Mobility is the ratio of drift velocity and ________?

• A. Current
• B. Electric field
• C. Charge
• D. Resistance

Hint:

The mobility of charge carriers is a key parameter in semiconductor physics, describing how easily charge carriers can move in response to an electric field.

Answer 1

The Correct Option is B

The mobility of charge carriers (such as electrons or holes) is defined as the ratio of the drift velocity (\( v_d \)) of the carriers to the applied electric field (\( E \)): \[ \mu = \frac{v_d}{E} \] where: - \( \mu \) is the mobility of the charge carriers, - \( v_d \) is the drift velocity, - \( E \) is the electric field. Thus, mobility is directly related to the electric field and drift velocity. It is a measure of how quickly charge carriers move under the influence of the electric field. - Current: Current is related to the number of charge carriers and the drift velocity, but it is not directly related to the definition of mobility. - Charge: The charge of a particle affects the current but not the mobility directly. - Resistance: Resistance is related to how much a material resists the flow of current, but it is not used in the definition of mobility. Therefore, the correct answer is Electric field.