Home
Class 12
PHYSICS
Assertion: Drift velocity of electrons i...

Assertion: Drift velocity of electrons is independent of time.
Reason: Electrons are accelerated in the presence of electric field.

A

If both assertion and reason are true and reason is the correct explantion of assertion.

B

If both assertion and reason are true and reason is not the correct explantion of assertion.

C

If assertion is false but reason is true.

D

If assertion is true but reason is false.

Text Solution

Verified by Experts

The correct Answer is:
B
Drift velocity is the average velocity of electrons in presence of electric field, which is independent of time.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NCERT FINGERTIPS|Exercise NCERT Exemplar|6 Videos

  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS|Exercise HOTS|10 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

The drift velocity of electrons is given by

The average velocity of electrons in a conductor in the absence of electric field is

Assertion: Through large number of free electron are present in the metal, yet there is no current in the absent of electric field. Reason: In the absence of electric field, electrons move remdomly in all directions

State the direction of drift velocity of electron with respect to the appliled electric field.

Define drift velocity of free electron . If relaxation time is r then write a vector relation b etween drift velocity and electric field.

Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire decreases.

Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire decreases.

Assertion: Drift velocity of electrons developed in a current-carrying conductor is of the order of 10^(-4) m//s but current in the conductor is established almost instantly the switch is closed. Reason: Electric field in a conductor sets up with the speed of light.