# Wire Magnetic Field Question

1. Jul 20, 2004

### thebigbluedeamon

I cannot figure how this works..

A wire carries a 7.00 A current along the x-axis and another wire carries a 6.00 A current along the y-axis. What is the magnetic field at point p located at x=4.00m and y=3.00m.

Since each wire carries its own magnetic field, my instinct is saying that I just need to add the magnitude of the two fields. But that doesn't seem correct.

A speedy reply would be greatly appreciated.

Last edited: Jul 20, 2004
2. Jul 20, 2004

### Staff: Mentor

That's all there is to it. Be sure you have the correct sign (direction) of each field when you add them.

3. Jul 20, 2004

### thebigbluedeamon

So would the direction of the field in the y-direction be negative and the direction in the x-direction be positive?

I guess I would end up with something like....

Bnet = Bx - By

Sounds easy enough for me.

4. Jul 20, 2004

### Staff: Mentor

The current along the y-axis creates a field (at the point in question) that is in the -z direction; the current along the x-axis creates a field in the +z direction.