Recent content by barnflakes

If I have a coil with 10 turns and a primary voltage $$V_p$$ and primary current $$I_p$$ and a single secondary coil with 10 turns, I understand the power in the secondary will be $$P=V_pI_P$$ and hence voltage and current in the secondary coil will be the same. If I now bring a 3rd coil with...

According to the following website listing the yields of fission products for Uranium and other transuranic isotopes: https://www-nds.iaea.org/sgnucdat/c3.htm The fission product 63-Eu-155 is rare but not impossible. According to my maths, this means there must be another daughter nuclei with...

The disk will have angular momentum, causing the precession. The bar magnet won't. That is the heat of my question.

No initial angular momentum. I don't have access to the text you linked, could you perhaps summarise the results of the problem?

Let's just consider an idealised dipole and forget about the cause of the magnetic moment. In this case, the bar magnet should not precess. Do we agree on that?

Let's say we have a north south bar magnet and we place it in a uniform magnetic field such that the magnetic moment is perpendicular to the magnetic field. What happens to the orientation of the magnet? In my view, the magnet receives a torque pointing out of/in to the page that causes the...

If you take the rest frame of the nucleus, does the electron have non-zero velocity (or better, momentum)?

It is nothing to do with classical or quantum intuition. It is a simple physical question: does an electron move around a nucleus? I do not mean in the sense of an electron orbiting in the sense of the Earth orbiting the sun. I simply mean: does the electron move around a nucleus at all?

Yes. It answered nothing. Perhaps you can refer to a specific part of the paper that apparently answers my question?

Yes but I'm referring specifically to orbital angular momentum here.

A quote from Griffiths "Introduction to Quantum Mechanics" page 171: "In addition to orbital angular momentum, associated (in the case of hydrogen) with the motion of the electron around the nucleus (as described by the spherical harmonics), the electron carries another form of angular...

So let me summarise what I think I've learned from this thread: Noether's theorem tells us that invariance with respect to certain physical transformations leads to a conservation law. Invariance with respect to time leads to conservation of energy, invariance with respect to translation leads...

That's a good point and something I hadn't thought about. What is mass? What is charge? At some point you boil everything down into things that are "irreducible", at least as far as physics knows. That is clearly not the case for angular momentum, which is defined in terms of other quantities...

Spin is a fundamental property of an elementary particle, just like mass or charge. Double-slit: quantum particles have both wave and particle like nature. A single quantum particle can pass through two-slits at once, just as a wave can. However, when we measure the position of the particle on...

OK, I have finally figured out how to ask this question so that I stop getting these kind of tautological responses. Angular momentum can only exist if something is rotating. In the hydrogen atom solution of Schrödinger's equation, what is rotating? If it's not the electron around the...