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When a current-carrying rectangular loop is placed in a magnetic field, the forces acting on either side of the loop which is perpendicular to the field provides a torque which...
Asked on 07/04/2021
1 answerAssuming correct orientation, do magnetic things fall faster than non-magnetic ones because of the magnetic field of the Earth? Of course it is clear that if any, the effect is...
Asked on 07/04/2021 by T_01
3 answerMy question concerns the gauge fixing in classical v.s. quantum $U(1)$ gauge theory. I will ask about the gauging fixing in quantum $U(1)$ gauge theory in a separated...
Asked on 07/04/2021
1 answerI am reading a quantum optics paper on superradiance and subradiance. In building their Hamiltonian, the authors define an operator$ J_pm(t)=sum^N_{n=1}sigma^{(n)}_pm exp{left(pm i delta omega_n...
Asked on 07/04/2021 by darienmorrow
2 answerI am not understanding how to derive this particular expression, which relates the inexact differential of work to the exact differential of volume,$$delta w = -PdV $$ My...
Asked on 07/04/2021 by LamGyro
1 answerThe low-energy effective action of the bosonic string is given by:$$S=frac{1}{2k_0^2}int d^{26}Xsqrt{-G}e^{-2Phi}Big(mathcal{R}-frac{1}{12}H_{munulambda}H^{munulambda}+4partial_muPhipartial^muPhiBig)$$where $H_{munulambda}=partial_mu B_{nulambda}+partial_nu B_{lambdamu}+partial_lambda B_{munu}$. There are three fields: the space-time metric $G_{munu}$, the...
Asked on 07/04/2021
1 answerI know that the throttling device reduces pressure of the gas but that's it. I can't somehow imagine how the change in cross-sectional area can affect how the particles of...
Asked on 07/04/2021
2 answerWe saw in class that the Wigner-Eckart theorem is, $$langle alpha', j',m'|T^{(k)}_{q}|alpha, j, m rangle = langle j,k;m,q|j',m'rangle frac{langle alpha', j'||T^{(k)}||alpha, j rangle}{sqrt{2j + 1}}...
Asked on 07/04/2021
1 answerMy main research interest is the gravitational wave. Recently, I and my academic brother watched a famous video about the superfluid. I read a review then came up with some...
Asked on 07/03/2021 by Hamio Jiang
0 answerThe heat dissipated by a resistor is given by the formula$$ I^2 R $$ Any circuit portion has an equivalent resistance. Does that mean that the heat...
Asked on 07/03/2021 by Dinis
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