Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Determine the magnetic field strength

  1. May 1, 2005 #1
    I have racked my brain for the past two hours and I can't figure this out. If any one can help me with, please do.

    Two long parallel wires 6.00 cm apart carry 19.5 A currents in the same direction. Determine the magnetic field strength at a point 12.0 cm from one wire and 13.4 cm from the other. (Hint: Make a drawing in a plane containing the field lines, and recall the rules for vector addition.)

    I found the magnetic field for each of the wires seperately using B = Mo(I)/ r

    but I cannot understand what the "vectors" have to do with the problem.
  2. jcsd
  3. May 1, 2005 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    The magnetic field (just like the electric field) is a vector quantity; therefore when superposing two fields, you must use the rules of vector addition.

    Check your text or Google for how to add vectors.
  4. May 1, 2005 #3

    Doc Al

    User Avatar

    Staff: Mentor

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook