Recent content by Henry Morton

Yes, thanks a bunch.

What does this mean? (\vec A\cdot\nabla)\vec B I read somewhere that (\vec A\cdot\nabla)\vec B=\vec A\cdot\nabla\vec B but this must be nonsense since you can't take the gradient of a vector.

Thanks. So if curl B = 0 at some point basically means that there is no source of magnetic field there? And then if curl B = 0 everywhere, it means there is no magnetic field? I guess this is what maCrabo means. I think a problem for me is that I have always been used say that if curl B =...

Well, the reason I'm asking this is because we recently did a problem in my class where we were supposed to show some vector identity, with the conditions that both curl B = 0 and div B = 0 The problem was really about the maths, but it was phrased as if the field were a magnetic...