Recent content by bryanso

Ok ok. Much better. Thx

OK OK. Now I understand. They are not pure mathematical vectors that just cancel out BEFORE acting on other things. More like two bullets firing, one to the left, one to the right. The vectors cancel out. But people die! (Perok... thanks for your sea urchin throwing thought experiment...)

[FONT=Courier New] -q ... q (sorry can't get spacing to work) <-------- Q --------> test charge here Q is a point charge. q is the electric field vector pointing to the right. At test charge position, there should be no electric field. Vector q is canceled by vector -q.

Hmm... not sure how to counter your argument.

Not really. Wind doesn't radiate in all direction like a sea urchin. But point charge does.

How can we detect electrical effect of a static point charge at all? I think of a point charge like a sea urchin. With field lines going outwards in all directions (for +ve). So the vector pointing at me directly should be canceled perfectly by the vector going away from me. And so each line...

Thanks for the recommendation. I was just trying to complete all his lectures due to "completionism". I do sense it's too terse as a formal overview of this topic. Thanks again.

Thanks. The second question is about the definition of Work done by this engine. When I read that "The gas cylinder has now reached the temperature T2, so that if we put it on the heat pad at temperature T2 there will be no irreversible changes. Now we slowly compress the gas while it is in...

Hi, there is no other topics in my adventure in Feynman Lectures that makes me so loss in thoughts (https://www.feynmanlectures.caltech.edu/I_44.html). I seem to understand every sentence. But the whole thing is completely unintelligible. Let me start by asking one fundamental question. I am...

Thanks a lot. Great insights.

Feynman's Lectures, vol. 1 Ch. 28, Eq. 28.3 is ##r'## is the distance to the apparent position of the charge. Feynman wrote, "Of the terms appearing in (28.3), the first one evidently goes inversely as the square of the distance, and the second is only a correction for delay, so it is easy...

Thanks a lot. I think you are right. I couldn't think of this! This picture should be posted to the Feynman site for help :)

https://www.feynmanlectures.caltech.edu/I_19.html "Suppose we have an object, and we want to find its moment of inertia around some axis. That means we want the inertia needed to carry it by rotation about that axis. Now if we support the object on pivots at the center of mass, so that the...

Thanks. I have edited the equations.

Yes I had a typo. I will try to edit it. The question remains.