Write the mathematical relation between Mobility And Drift Velocity of charge carriers in a conductor.

Electron mobility is the drift velocity per unit strength of the electric field applied across the conductor. It is denoted by \(\mu\).

  • The SI unit of electron mobility is meter2volt-1second-1 (m2V-1s-1).
  • The mathematical relation between mobility and drift velocity of charge carriers is given by the formula:

\(\mu = {V_d \over E}\)

  • where, Vd refers to the drift velocity by free electrons on applying an electric field.
  • and E denotes an Electric field.

Related Questions

  1. Define mobility of electron.
  2. Give two examples of drift velocity.
  3. Explain the relation between current and drift velocity.
  4. Define the drift velocity of electrons in a conductor?
  5. What is the relation between drift velocity and electric field?
  6. Define relaxation time of the free electrons drifting in a conductor? How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for the electrical resistivity of the material.
  7. Two conducting wires X and Y of the same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of the drift velocity of electrons in the two wires.
  8. It is known that the drift velocity of electrons is only a few mm/s for a current of a few amperes. How is it possible that a current is established almost instantaneously when a circuit is closed? For example, a bulb glows as soon as the connection is switched on. Explain.

Read More:

CBSE CLASS XII Related Questions

  • 1.
    Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.


      • 2.
        Write any two features of nuclear forces.


          • 3.
            Assertion (A) : All atoms have a net magnetic moment. Reason (R) : A current loop does not always behave as a magnetic dipole.

              • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
              • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
              • Assertion (A) is true, but Reason (R) is false.
              • Both Assertion (A) and Reason (R) are false.

            • 4.
              Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.


                • 5.
                  What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?


                    • 6.
                      The figure shows three point charges kept at the vertices of triangle ABC. The net electric field, due to this system of charges, at the midpoint M of base BC will be:

                        • \( \frac{q}{4 \pi \epsilon_0 l^2} \) pointing along MA
                        • \( \frac{q}{\pi \epsilon_0 l^2} \) pointing along AM
                        • \( \frac{q}{2 \pi \epsilon_0 l^2} \) pointing along AM
                        • Zero
                      CBSE CLASS XII Previous Year Papers

                      Comments


                      No Comments To Show