
When current flows through a conductor, then the order of drift velocity of electrons will be?
A. ${10^{10}}cm/s$
B. ${10^{ - 2}}cm/s$
C. ${10^4}cm/s$
D. ${10^{ - 1}}cm/s$
Answer
163.8k+ views
Hint: In this case, we will assume the ideal conditions to find the order of drift velocity of electrons. Also, we know that all the parameters in current electricity vary with each other (directly or indirectly) i.e., current, voltage, resistance, etc. Hence, analyze every aspect of the solution needed and then present it with a proper explanation in a scientific approach.
Formula used:
Drift Velocity of electrons can be calculated by using formula,
$v = \dfrac{I}{{nAQ}}$
Where, v = drift velocity of electrons in $m/s$
I = current flowing through the conductor
n = number of electrons
A = area of cross section of the conductor
Q = charge of an electron
Complete step by step solution:
As we all know, electrons move with different velocities in an arbitrary direction in absence of an electric field inside a conductor. But, whenever an electric current flows through a conductor, the electrons start moving towards positive potential with a certain velocity. The average velocity acquired by a charged particle in a conductor due to an electric field is called drift velocity.
Drift Velocity of electrons (or any charged particle) can be calculated by using formula
$v = \dfrac{I}{{nAQ}}$
By assuming ideal conditions such as $I = 1A$or $A = 1m/{s^2}$, the order of drift velocity of electrons can be calculated as ${10^{ - 4}}m/s$. This means, when current flows through a conductor, then the order of drift velocity of electrons will be ${10^{ - 4}}m/s$ i.e., ${10^{ - 2}}cm/s$.$(\therefore 1m = 100cm)$
Hence, the correct option is B.
Note: Since this is a partial-numerical-based problem hence, it is essential that the given question is to be analyzed very carefully to give an accurate solution. Also, as we assumed the ideal conditions to solve this question, we should know that the value of the drift velocity of electrons changes with the other values of current, cross-sectional area, etc., but the order will always remain the same.
Formula used:
Drift Velocity of electrons can be calculated by using formula,
$v = \dfrac{I}{{nAQ}}$
Where, v = drift velocity of electrons in $m/s$
I = current flowing through the conductor
n = number of electrons
A = area of cross section of the conductor
Q = charge of an electron
Complete step by step solution:
As we all know, electrons move with different velocities in an arbitrary direction in absence of an electric field inside a conductor. But, whenever an electric current flows through a conductor, the electrons start moving towards positive potential with a certain velocity. The average velocity acquired by a charged particle in a conductor due to an electric field is called drift velocity.
Drift Velocity of electrons (or any charged particle) can be calculated by using formula
$v = \dfrac{I}{{nAQ}}$
By assuming ideal conditions such as $I = 1A$or $A = 1m/{s^2}$, the order of drift velocity of electrons can be calculated as ${10^{ - 4}}m/s$. This means, when current flows through a conductor, then the order of drift velocity of electrons will be ${10^{ - 4}}m/s$ i.e., ${10^{ - 2}}cm/s$.$(\therefore 1m = 100cm)$
Hence, the correct option is B.
Note: Since this is a partial-numerical-based problem hence, it is essential that the given question is to be analyzed very carefully to give an accurate solution. Also, as we assumed the ideal conditions to solve this question, we should know that the value of the drift velocity of electrons changes with the other values of current, cross-sectional area, etc., but the order will always remain the same.
Recently Updated Pages
Uniform Acceleration - Definition, Equation, Examples, and FAQs

JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

Atomic Structure - Electrons, Protons, Neutrons and Atomic Models

Displacement-Time Graph and Velocity-Time Graph for JEE

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Electric field due to uniformly charged sphere class 12 physics JEE_Main

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

JEE Advanced Weightage 2025 Chapter-Wise for Physics, Maths and Chemistry

Degree of Dissociation and Its Formula With Solved Example for JEE

Wheatstone Bridge for JEE Main Physics 2025

Charging and Discharging of Capacitor
