Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Home

Physics Part-I

Current Electricity

The number density of free electrons in a copper conductor est

Physics Part-I

Class 12

NCERT

Chapter 1: Electric Charges and Fields

47 questions

Chapter 2: Electrostatic Potential and Capacitance

46 questions

Chapter 3: Current Electricity

33 questions

In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0 cm, what is the emf of the second cell?

The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 × 1028 m–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 × 10–6 m2 and it is carrying a current of 3.0 A.

The earths surface has a negative surface charge density of

1 0^{- 9} C m^{- 2}

. The potential difference of 400 kV between the top of the atmosphere and the surface results (due to the low conductivity of the lower atmosphere) in a current of only 1800 A over the entire globe. If there were no mechanism of sustaining atmospheric electric field, how much time (roughly) would be required to neutralise the earths surface? (This never happens in practice because there is a mechanism to replenish electric charges, namely the continual thunderstorms and lightning in different parts of the globe). (Radius of earth =

6.37 \times 1 0^{6}

m.)

View all question

Chapter 4: Moving Charges and Magnetism

41 questions

Chapter 5: Magnetism and Matter

36 questions

Chapter 6: Electromagnetic Induction

28 questions

Chapter 7: Alternating Current

37 questions

Chapter 8: Electromagnetic Waves

20 questions

Question

Medium

Solving time: 4 mins

The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 × 1028 m–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 × 10–6 m2 and it is carrying a current of 3.0 A.

Views: 6,371 students

Updated on: Feb 25, 2024

Book:

Physics Part-I (NCERT)

Found 4 tutors discussing this question

Camila Discussed

5 mins ago

Discuss this question LIVE

5 mins ago

Text solutionVerified

Number density of free electrons in a copper conductor,

n = 8.5 \times 1 0^{28} m^{- 3}

Length of the copper wire,

l = 3.0 m

Area of cross-section of the wire,

A = 2.0 \times 1 0^{- 6} m^{2}

Current carried by the wire,

l = 3.0 A

, which is given by the relation,

I = nAeV_{d}

Where,

e = Electric charge = 1.6 \times 1 0^{- 19} C V_{d} = Drift velocity = \frac{Length of the wire ( l )}{Time taken to cover l ( t )} I = n Ae \frac{l}{t} t = \frac{n Ael}{I} = \frac{3 \times 8.5 \times 1 0 ^{28} \times 2 \times 1 0 ^{- 6} \times 1.6 \times 1 0 ^{- 19}}{3.0} = 2.7 \times 1 0^{4} s

Therefore, the time taken by an electron to drift from one end of the wire to the other is

2.7 \times 1 0^{4} s

Was this solution helpful?

Report

Filo tutor solutions (7)

Learn from their 1-to-1 discussion with Filo tutors.

6 mins

Uploaded on: 8/29/2023

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Ubaid

Total classes on Filo by this tutor - 12,615

Teaches : Physics, Mathematics, Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (2 pages)

Download

Was this solution helpful?

Report

1 mins

Uploaded on: 8/1/2022

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Ajay Singh

Total classes on Filo by this tutor - 15,509

Teaches : Physics, Mathematics, Biology

Connect instantly with this tutor

Connect now

Notes from this class (1 pages)

Download

Was this solution helpful?

135

Report

2 mins

Uploaded on: 2/25/2024

Ask your question, on a video call with tutor

Connect instantly with this tutor

Connect now

Taught by

Dr.abhinav Yadav

Total classes on Filo by this tutor - 802

Teaches : Physics, Biology, Organic Chemistry

Connect instantly with this tutor

Connect now

Notes from this class (1 pages)

Download

Was this solution helpful?

Report

See more 1-on-1 discussions (4)

One destination for complete JEE/NEET preparation

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Practice more questions from Physics Part-I (NCERT)

The earths surface has a negative surface charge density of

1 0^{- 9} C m^{- 2}

6.37 \times 1 0^{6}

m.)

View all

Stuck on the question or explanation?

Connect with our Physics tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 × 1028 m–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 × 10–6 m2 and it is carrying a current of 3.0 A.
Updated On	Feb 25, 2024
Topic	Current Electricity
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 7
Upvotes	692
Avg. Video Duration	4 min

The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 × 1028 m–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 × 10–6 m2 and it is carrying a current of 3.0 A.

Text solutionVerified

Filo tutor solutions (7)

Practice more questions from Physics Part-I (NCERT)

Practice questions from Physics Part-I (NCERT)

Practice more questions from Current Electricity

Practice questions on similar concepts asked by Filo students

The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 × 1028 m–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 × 10–6 m2 and it is carrying a current of 3.0 A.

Text solutionVerified

Filo tutor solutions (7)

Practice more questions from Physics Part-I (NCERT)

Practice questions from Physics Part-I (NCERT)

Practice more questions from Current Electricity

Practice questions on similar concepts asked by Filo students

Related books for questions on Current Electricity