Recent content by gurbir_s

Yes. Sorry, it took me so long to make the question clear. However, I can't find any reference to the angular momentum in the above mentioned Wikipedia article.

Yes. The angular momentum carried by the circular current carrying wire without applying any field. Just like in the classical picture, the electrons revolving around nucleus, have an angular momentum and give rise to magnetic moment, by that analogy, since the wire loop has magnetic moment, I...

How to quantify it?

It is simply a resistive wire in the shape of a circle connected to a DC source. Actually, I read somewhere that such a loop placed in a magnetic field will simply get aligned in the direction of field. But if it carried an angular momentum, it should have precessed around the applied field.

How should I calculate the angular momentum carried by a current carrying circular wire? Is it correct to consider the angular momentum of the electrons moving with drift velocity? Like ##L = n m_e v_{drift} r## where ##r## is radius of the loop, and ##n## is total number of electrons moving in...

The ##X_i##'s are elemental abundances during Big Bang Nucleosynthesis. I set the initial conditions equal to their thermal equilibrium values at that point. I don't know how, but the problem got solved automatically while I was trying to solve another problem. Idk how. Thanks for your reply.

The set of equations is I have first tried to solve only first two equations (removing the components of other 4 equations from them.) This is the output, where first column is the time, 2nd - X_p, and 3rd - X_n

Yes, ##z## should be the contribution from one particle only as the integral is over a 6d phase space.

There would still be a minus sign left in the exponential and a volume term V outside.

Thank you : ) @BvU. I was struggling with this problem from quite a few days.

The time rate of change of neutron abundance ##X_n## is given by $$\frac{dX_n}{dt} = \lambda - (\lambda + \hat\lambda)X_n$$ where ##\lambda## is neutron production rate per proton and ##\hat\lambda## is neutron destruction rate per neutron. Given the values of ##\lambda## and ##\hat\lambda## at...