1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Am I on the right track with Ampere's Law?

  1. Mar 29, 2009 #1
    1. The problem statement, all variables and given/known data
    A wire carries a current of 3 A in the downward direction. What is the magnetic field 2.0 cm away from the wire?


    2. Relevant equations
    ∫B·dl = µ0I


    3. The attempt at a solution
    So I pick a circle with radius 2.0 cm to go around the wire, and get

    B∫dl = µ0(3 A)

    ∫dl evaluates to 2pi(0.02 m).

    So B = [µ0(3 A) ] / 2*pi*0.02 m?
     
  2. jcsd
  3. Mar 30, 2009 #2
    That works, however the Biot-Savart law is easier to apply here and actually reduces to a formula identical to what you have written in the last line in the case of a long straight wire. B=µ0I/2(pi)r
     
  4. Mar 30, 2009 #3
    Thank you! I know the Biot-Savart law also works, I just wanted to make sure my concept of Ampere's Law was correct. =)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Am I on the right track with Ampere's Law?
  1. Am I on the right track? (Replies: 25)

Loading...