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Magnetic field from two wires and magnitude

  1. May 22, 2009 #1
    1. The problem statement, all variables and given/known data

    can someone please help? im having major problems with physics right now :(

    Each of the wires carries a current of magnitude I. The current in wire 1 is directed out of the page and that in wire 2 is directed into the page. The distance between the wires is 2d. The x axis is perpendicular to the line connecting the wires and is equidistant from the wires.


    a.) Point M is located a distance 2d from the midpoint between the two wires. Find the magnitude of the magnetic field B_1M created at point M by wire 1.
    *Express your answer in terms of I, d, and appropriate constants.

    b.)Find the magnitude of the net magnetic field B_M created at point M by both wires.
    *Express your answer in terms of I, d, and appropriate constants.

    2. Relevant equations

    189576A.jpg

    3. The attempt at a solution


    I got the B1L created by wire 1 by point 1 only.
    so I thought since they have the same current and distance, they will have the same magnitude, so I just add them. But I got it wrong.
    one of the hint says "find the direction of B"
    I am confused how to find the direction for wire 1 and 2 at point M.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 22, 2009 #2

    diazona

    User Avatar
    Homework Helper

    Well, let's take it one step at a time. First, pretend wire 2 doesn't exist, and find the magnetic field (magnitude and direction) produced by wire 1 at point M. Do you know how to start doing that? (Hint: use the right-hand rule for the direction)
     
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