Drift Problem MCQ Quiz - Objective Question with Answer for Drift Problem - Download Free PDF

Last updated on Apr 19, 2025

Latest Drift Problem MCQ Objective Questions

Drift Problem Question 1:

The average drift velocity vd of electrons in a metal is related to electric field E and collision time τ as

  1. vd=QeEτme
  2. vd = - meQeτ
  3. vd=meQeτ2e
  4. vd=QeEτ2me

Answer (Detailed Solution Below)

Option 1 : vd=QeEτme

Drift Problem Question 1 Detailed Solution

Drift velocity:

It is the average velocity with which the electrons get drifted towards the positive terminal of the conductor in an electric field.

At any instant of time, the velocity acquired by the electrons with thermal velocity 'u1' and acceleration 'a' is given by:

Vd=u1+aτ..........(i)

where Vd= Drift velocity

u1 = Average thermal velocity

a = Acceleration

τ = Relaxation time 

The sum of averages of the thermal velocities of 'n' electrons in the conductor is 0.

∴ u1 = 0

The acceleration of an electron placed in an electric field is:

a=Fme

a=QeEme.................(ii)

Putting the value of equation (ii) in (i), we get:

Vd=0+aτ

Vd=QeEτme

Top Drift Problem MCQ Objective Questions

The average drift velocity vd of electrons in a metal is related to electric field E and collision time τ as

  1. vd=QeEτme
  2. vd = - meQeτ
  3. vd=meQeτ2e
  4. vd=QeEτ2me

Answer (Detailed Solution Below)

Option 1 : vd=QeEτme

Drift Problem Question 2 Detailed Solution

Download Solution PDF

Drift velocity:

It is the average velocity with which the electrons get drifted towards the positive terminal of the conductor in an electric field.

At any instant of time, the velocity acquired by the electrons with thermal velocity 'u1' and acceleration 'a' is given by:

Vd=u1+aτ..........(i)

where Vd= Drift velocity

u1 = Average thermal velocity

a = Acceleration

τ = Relaxation time 

The sum of averages of the thermal velocities of 'n' electrons in the conductor is 0.

∴ u1 = 0

The acceleration of an electron placed in an electric field is:

a=Fme

a=QeEme.................(ii)

Putting the value of equation (ii) in (i), we get:

Vd=0+aτ

Vd=QeEτme

Drift Problem Question 3:

The average drift velocity vd of electrons in a metal is related to electric field E and collision time τ as

  1. vd=QeEτme
  2. vd = - meQeτ
  3. vd=meQeτ2e
  4. vd=QeEτ2me

Answer (Detailed Solution Below)

Option 1 : vd=QeEτme

Drift Problem Question 3 Detailed Solution

Drift velocity:

It is the average velocity with which the electrons get drifted towards the positive terminal of the conductor in an electric field.

At any instant of time, the velocity acquired by the electrons with thermal velocity 'u1' and acceleration 'a' is given by:

Vd=u1+aτ..........(i)

where Vd= Drift velocity

u1 = Average thermal velocity

a = Acceleration

τ = Relaxation time 

The sum of averages of the thermal velocities of 'n' electrons in the conductor is 0.

∴ u1 = 0

The acceleration of an electron placed in an electric field is:

a=Fme

a=QeEme.................(ii)

Putting the value of equation (ii) in (i), we get:

Vd=0+aτ

Vd=QeEτme

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