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Homework Help: Biot Savart Law Calculation problems

  1. May 4, 2013 #1
    1. The problem statement, all variables and given/known data
    Find the magnetic field from a proton at location r, with velocity v, if the cross-product of vxr is <0,0,6.2e4> and the magnitude of r is 7.34e-2

    2. Relevant equations

    B⃗ =μ/4π * qv x r /r^2

    3. The attempt at a solution
    Substituting in 10^7 for μ/4π
    1.6e-19 for q
    <0,0,6.2e4> for v x r
    and (7.34e-2)^2 for r^2

    I get 1.8413e-5. This is not the right answer, so I must be doing something wrong. I thought you simply had to substitute in the variables and calculate. Could someone give me a hint?
  2. jcsd
  3. May 4, 2013 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    How are we supposed to check your work if you don't provide any units?
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