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!

What then is in unit-vector notation if Bx = By?

  1. Mar 29, 2007 #1
    1. The problem statement, all variables and given/known data

    In the product F = qv x B , take q = 4,
    v = 2.0i + 4.0j + 6.0k and F= 136i -176j + 72k.
    What then is in unit-vector notation if Bx = By?

    2. Relevant equations

    136i-176j+72k = 8i+16j+24k + Bxi+Byj+Bzk

    3. The attempt at a solution

    I am stuck with the above equation. How do I solve for Bxi, Byj and Bzk?
     
  2. jcsd
  3. Mar 29, 2007 #2

    GmL

    User Avatar

    You're not adding the B-components, you're taking the cross product. Recall the 3x3 matrix with i, j, and k in r1. You have to find the determinant of that matrix to solve for F, which is given to you.
     
  4. Mar 29, 2007 #3
    oops I did a typo. I know that. It's:
    136i-176j+72k=8i+16j+24k X Bxi+Byj+Bzk
    So If I find the determinant from the right hand side it's:
    136i-176j+72k=((16)(Bz)-(By)(24))i+((24)(Bx)-(Bz)(8))j+((8)(By)-(16)(Bx))k
    136i-176j+72k=(16Bz-24By)i+(24Bx-8Bz)j+(8By-16Bx)k

    Now what do I do???
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: What then is in unit-vector notation if Bx = By?
Loading...