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!

Magnitude of Magnetic Field

  1. Jan 26, 2005 #1
    I understand that it needs to relate to the following equation but that is it. [tex]B=\frac{\mu_{0} I}{2\Pi r}[/tex]

    I am unsure how to derive an answer for this, I am drawing a blank on solving this. Can anyone give me any helpful hints?
     
    Last edited: Jan 26, 2005
  2. jcsd
  3. Jan 26, 2005 #2
    what is the direction of the current???? post the whole question pls....
     
  4. Jan 26, 2005 #3
    That is the full question, the current is running through a hollow cylinder. From how I understand the current is flowing through direction of the hieght of the cylinder.
     
  5. Jan 26, 2005 #4
    find the [itex] \ver{A} [/itex] first, then B
     
  6. Jan 26, 2005 #5
    [tex]\oint{\vec{B}\vec{dl}}=\mu_0\int{\int_S{j}}ds[/tex]
    and from this you can simply derive

    [tex]B(r)2\pi r=\mu_0 j \cdot \pi(r^2-a^2)[/tex]

    where
    [tex]j=\frac{I}{\pi (b^2-a^2)}[/tex].
     
  7. Jan 26, 2005 #6
    Thanks to both of you. Clive you pointed out a part in which I made an error in my thinking of my previous answer. Appreciate the help.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?