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Ok here's my question:

The drawing (attachment) shows two wires that carry the same current of I=85.0 A are are oriented perpendicular to the plane of the paper. The current in one wire is directed out of the paper, while the current in the other is directed into the paper. Find the magnitude and direction of thenet magnetic field at point P.

For those who can't get the attacment, the drawing is simple:

Code:

```
P
X 0
```

Ok it seems that I just have to use: B=uI/2pieR

Using the right hand rules I draw two circlular fields reaching point P sort of like venn diagrams. Ok the radius is really just the distance from the currents to the P, so R=0.150m.

Plug in numbers:

B=4pie x 10^-7 (85.0A)/ 2pie (0.150m)

B=1.133x10^-4 T.

Ok, I know B2=B1? so All I have to do is find the net

which is B3 (going downards)=SQRT(B1^2+B2^2)

and B3 turns out to be SQRT(2.55x10^-8)

which is 1.60x10^-4 T?

Anyone want to say correct? or wrong... :uhh: