What factors do drift velocity depends?

What factors do drift velocity depends? The drift velocity is known to be primarily dependent on the applied voltage and another property on which it depends is the molecular structure of the wire and hence the material of the conductor. Slight temperature dependence is also observed.

Is drift velocity depend on diameter? No.It is not dependent on Cross sectional area or the length of the wire.

What happens to drift velocity when area is doubled? The relation for drift velocity i=neυdA From it when current is constant Aυd is constant when radius is doubled, area becomes four times. Hence the drift velocity become one fourth (41) .

What is drift velocity affected by? Relation between Drift Velocity and Electric Current

Mobility is always a positive quantity and depends on the nature of the charge carrier, the drift velocity of an electron is very small usually in terms of 103ms1.

What factors do drift velocity depends? – Additional Questions

How does drift velocity vary with length?

At constant potential difference, drift velocity is inversely proportional to the length of the conductor.

What happens to drift velocity when diameter is halved?

Thus when diameter is halved the drift velocity increases to 4 times the initial drift velocity.

How does drift velocity depend on applied voltage?

vd is the drift velocity of the charge carriers. It is primarily controlled by the applied voltage, although it also depends the molecular structure of the wire. (In an ohmic device this velocity is directly proportional to applied voltage and thus provides the linear relationship between current and applied voltage.)

How does drift affect electron mobility?

The drift velocity is very small, much smaller than the speed of light; however, the effects of electricity travel much faster than the drift velocity due to interactions between electrons. Electron mobility is how easily electrons move through a material. It is dependent on the drift velocity and the electric field.

Why is drift velocity opposite to electric field?

When a potential difference is applied across a conductor, free electrons gain velocity in the direction, opposite to the electric field between successive collisions (and lose velocity when traveling in the direction of the field), thus acquiring a velocity component in that direction in addition to its random thermal

Is drift velocity constant?

For a given amount of charge per unit volume, the drift velocity V is proportional to the current density, or I/A. Since for a fixed voltage if A increases I increases and if A decreases I decreases, the drift velocity remains constant.

What is the relation between drift velocity and mobility?

Mobility is defined as the value of drift velocity over electric field strength. Therefore, higher the drift velocity of the particle higher is the mobility.

Why do electrons have higher mobility than holes?

Since holes are subjected to the stronger atomic force pulled by the nucleus than the electrons residing in the higher shells or farther shells, holes have a lower mobility. because electron effective mass is smaller than holes therefore mobility of electron is higher than holes.

Does mobility depend on electric field?

Usually, the electron drift velocity in a material is directly proportional to the electric field, which means that the electron mobility is a constant (independent of the electric field). When this is not true (for example, in very large electric fields), mobility depends on the electric field.

What is the relation between drift velocity and relaxation time?

The drift velocity is just the average velocity of the charge carriers in the conductor. So, as you now see, the drift velocity is proportional to the relaxation time . As the relaxation time increases the drift velocity increases, because the charge carriers have more time to accelerate between collisions.

What is the relation between drift velocity and temperature?

The drift velocity is also slightly temperature-dependent: an increase in temperature causes atoms to vibrate more, which increases the number of collisions electrons have on their way through the wire and decreases the drift velocity.


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