# Magnetix flux density & Zero scalar potential

1. ### baggiano

13
Hi

Can anybody tell how I can prove that the magnetic flux density is perpendicular to external boundaries with imposed zero magnetic scalar potential?

Thanks

Bag

2. ### Bob S

I believe that for any field that satisfies Laplace's equation (divergence of a gradient), the equipotential lines (curl of the gradient) are orthogonal to the gradient. Is this what you mean?

Bob S

3. ### baggiano

13
Thanks for the reply and for your explanation. That precisely explains what I meant. Thanks again.