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## Homework Statement

Derive the boundary conditions for the

**B**field imposed by div

**B**=0

I'm lost with this question, I don't really understand how boundary conditions work. D.J. Griffiths only really mentions how to arrive at the conclusion that:

B[itex]_{1}[/itex][itex]\bot[/itex]-B[itex]_{2}[/itex][itex]\bot[/itex]=0

but doesn't outline the method enough so that I can understand it. Any help would greatly be appreciated, even if its just a link in the right direction to understanding the concept.

Thanks

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