# Vector Potential

1. May 14, 2008

### germx

Hello all. I am hoping someone could lend a hand. I need to determine the vector potential of a long wire. I am given the B-field = ($$\mu$$I)/(2$$\pi$$r) and I know at some point I will need to use $$\nabla$$ X A. Thanks in advance.

2. May 14, 2008

### Phrak

What's the equation of $$\bar{B}$$ in terms of $$\bar{A}$$?

The magnetic field runs in rings around the conductor, so it only an azimuthal component.
This tells you that the A field generating B will be limited to radial and axial components.

Last edited: May 14, 2008