Recent content by Jairo Amaral

That's what I'm talking about. If the direction of the magnetic field was defined first, then it's just a matter of placing the cross product in the convenient order.

In the equations for electromagnetism, the magnetic fields have positive and negative directions, not north and south directions.

Even though it started with just north and south, at some point a positive direction was established, since we're using it right now. And the positive direction of the magnetic field points to the south pole of the magnet. I'm trying to find out how it all started.

So we'll all discover that, and we'll give it enough publicity so it isn't forgotten again.

I read it was both Benjamin Franklin and William Watson. I didn't know there was more than one version. It's neither work nor formal study, so it isn't urgent. But I plan to write about science for lay people in the future, so it'd be nice to know. It it's too much trouble for you to get the...

Hi! This is the convention. I'm asking how it appeared. Was it like "I arbitrate the positive direction is that way, and now will derive an equation to agree with it", or was it like "I arbitrate the equation is thus, and now we'll use it to find the directions"?

This is about the history of electromagnetism. I already know about the convention that defined which electric charge is the "positive" one, which ended up making the electron a negative particle. But what about the "positive" direction of the magnetic field? Does anybody here know how it was...

I would like to know how heat would flow in a material being struck by sunlight in vacuum. The usual examples of Fourier heat equation always uses boundaries with fixed temperature or under convection. How do I calculate this when the surface is absorbing and emitting radiation according to...