Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Help me answer: A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is ρ, how long will the charges take to travel a distance d ?

A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is ρ, how long will the charges take to travel a distance d ?

  • Option 1)  (2ρdA/I) 
  • Option 2)(2ρdA/IT) 
  • Option 3)(ρdA/I) 
  • Option 4)(ρdA/IT) 
 

Answers (2)

best_answer

As we learnt

Uniform flow of charge through a cross-section -

J=\frac{I}{A}=\frac{neA\upsilon _{d}}{A}

J=ne\upsilon_{d}

- wherein

\upsilon_{d}- Drift velocity

 

 I=nv_{d}\, e.A

\rho =\frac{q}{v}=ne

I=\rho v_{d}A \, \, or\, \, v_{d} =\frac{I}{\rho A}

\therefore t =\frac{d}{v_{d}}=\frac{PAd}{I}

 

 

 


Option 1)

\frac{2\rho dA}{I}

Option 2)

\frac{2\rho dA}{IT}

Option 3)

\frac{\rho dA}{I}

Option 4)

\frac{\rho dA}{IT}

Posted by

divya.saini

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2025 January 22 shift 1, 2 unofficial answer keys out; question paper solutions
anam-khan

JEE Main 2025 January 22 Shift 2 Exam Analysis: Theory-based questions from chemistry, maths rated lengthy
anam-khan

NTA moves JEE Main 2025 to January 28, 29 for 114 candidates citing technical snag at Karnataka centre

Latest Question