Biot Savart Law Calculation problems

[cherry_cat]

Homework Statement

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

Homework Equations

B⃗ =μ/4π * qv x r /r^2

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?

 

[SteamKing]

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