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Homework Help: Determining magnetic field around two parallel wires

  1. Feb 11, 2008 #1
    Two long, straight wires are separated by 0.12 m. The wires carry currents of 3.5 A in opposite directions, as the drawing indicates.

    (a) Find the magnitude of the net magnetic field at the point A.

    (b) Find the magnitude of the net magnetic field at the point B.


    here is what i did
    at point b, both wires B field point into the page (because of RHR) so i find the Bfield of each wire using B=((4(pi)x10e-7)x-3.5)/2x.06 =-3.67x10e-5 the other wire is the same mag. only positive because it is in the opposite direction. since both B fields ar in the same direction at point b i would just add the two together and that would give me the B field at that point. but this was incorrect. i would then do the same thing at point a but i wanted to get point b correct first. what have i done wrong
  2. jcsd
  3. Feb 11, 2008 #2


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    If you do not pay attention to where you are posting question like this, you may not be able to post on here that much longer.

  4. Feb 11, 2008 #3
    what do you mean?
  5. Feb 11, 2008 #4
    oh i see what you mean now. i didn't realize there was a homework section
  6. Feb 11, 2008 #5
    .....but can anyone help me with this problem
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