Adesh
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Yes your words are true our case here in this thread is different. My situation is such that I'm an autodidact from 3 years, so when I get some doubt no matter how basic I ponder over it and if I myself don't get a way out of it I just ask it over here. When an autodidact ask some basic doubts, people tend to think "Why is he asking such an obvious thing?" because when teachers teach those topics they cover some of the usual doubts (due to experience they know it) or it can happen that someone else in the class ask a doubt and things will get clear up.marcusl said:This is a problem of overreaching. The study of physics is a progression where each subject builds upon everything that came before. One won’t move forward (to quantum theory, for example) if there are holes in one’s preparation and mastery of basics, up to and including E&M.
Consider this example: In Griffiths, when he takes the curl of magnetic field, he just writes
$$ \left( \mathbf J \nabla\right) \hat{ r} = - \left (\mathbf J \nabla '\right) \hat{ r}$$
Without much clarification, but in the book suggested by @vanhees71 sir (Greiner's EM) this point is explained properly, that is how we moved from unprimed gradient to primed gradient. Just imagine if this thing were to be taught in a class room, this point would have been a obvious one because the instructor must have known it to be a common doubt.
So, this is the case here. I thought things would going to fine after a great reply of @hutchphd sir, but I don't know why a new user did something like that to me. But I have no hard feelings for anyone, everybody cheers.