Solving B.dl Question: Is Current 0 for Path AB?

  • Thread starter CH1991
  • Start date
  • Tags Tags
    Dot
2 replies · 5K views · last reply
CH1991
Messages
27
Reaction score
0

Homework Statement



Please check attachment or picture below.
http://i.imgur.com/PIwt0.png
Diagram of an infinitely long wire carrying current out of the page, with a quarter-circle closed loop of radius 5 cm and a straight chord from point A on the y axis to point B on the x axis, plus multiple-choice answers for the line integral of B dot dl from A to B.


Homework Equations





The Attempt at a Solution



Since there is no enclosed current for path AB, shouldn't it just be 0?
Thanks!
 
Attachments
  • Physics problem diagram: an infinitely long wire carrying current I = 5 A out of the page at the origin, with a closed loop made of a quarter circle of radius r = 5 cm and a straight chord from point A on the y axis to point B on the x axis, plus multiple-choice answers a) through e) for the integral of B dot dl from A to B.
    5.png
    39 KB · Views: 603

Discussion

CH1991 said:

Homework Statement



Please check attachment or picture below.
http://i.imgur.com/PIwt0.png
Multiple-choice physics problem: infinite wire carrying 5 A out of page, closed loop of quarter circle radius 5 cm plus chord from A on y-axis to B on x-axis; asks integral of B dot dl from A to B along the straight line, with options -1.57 X 10^-6, -6.28 X 10^-6, 0, +6.28 X 10^-6, +1.57 X 10^-6 T-m; answer A.


Homework Equations





The Attempt at a Solution



Since there is no enclosed current for path AB, shouldn't it just be 0?
Thanks!

The question does not ask for the integral around the closed path.
 

Similar threads

Archived Simple question on current electricity
  • Abhishekdas
  • · Replies 1 ·
  • Introductory Physics Homework Help
Replies
1
Graduate Question in current equation in small loop.
  • yungman
  • · Replies 13 ·
  • Electromagnetism
Replies
13
Undergrad Why probability current = 0 at infinity? Why must wavefunction be continuous?
  • Happiness
  • · Replies 4 ·
  • Quantum Physics
Replies
4