What Is the Correct Magnetic Field Strength at the Surface of a Wire?

[Lance WIlliam]

b]1. Homework Statement [/b]

What is the magnetic field strength 0.10 from the axis of a 1.0--diameter wire carrying 5.0 distributed uniformly over its cross section?
The answer is 4G I got the part right
Part B

What is the field strength at the surface of the wire?
I got this wrong...

Homework Equations

I got .001 I used the eqn (I can't find the symbol) but its the pereability consant...
so... (u_0_)(I)/2*pi*r

so...(4pi.e-7)(5)/2pi(.1e-3)



I got .001...

 

[marcusl]

Please provide the units in the statement of the problem.