Wednesday, February 22, 2017
if the charge of electrons was not the exact opposite of the charge of protons, the rings of Saturn would act as a current loop, resulting in a magnetic field. could you estimate the magnitude of the magnetic field (in terms of its dipole moment)?
Eingestellt von spirou um 2/22/2017 12:00:00 AM
Wednesday, February 15, 2017
could you estimate by how much the gravitational field of the sun is larger because of the high internal energy compared to simply the rest mass? can one write down a correction factor as a function of temperature $T$?
Eingestellt von spirou um 2/15/2017 12:00:00 AM
Wednesday, February 8, 2017
the Crab-pulsar is a rapidly spinning magnetic neutron star, which induces very large electric fields in the surrounding Crab-nebula, where the resulting electric currents are dissipated by Ohm losses. could you estimate the time-scale of this process and judge if it's a viable model for explaining the spin-down?
Eingestellt von spirou um 2/08/2017 12:00:00 AM