wheat frost
Why does the rho^3 just disappears in the last line? Doesn't make sense to me.
It's a physics question to calculate the electromagnetic field generated by a current that's distributed with density J = J0*rho*(rho - a)/a^2 on the z axis, where "a" is the cable radius.
The whole question is in portuguese so i dont think it would be useful to post it here but i can post the other calculations
modest torrent
It cz the the magnetic field B at a radial distance ρ from the z-axis, generated by a current distribution with density J = J0ρ(ρ - a)/a^2 on the z-axis, where "a" is the cable radius, is given by B = (μ0J0(R^4/4 - aR^3/3))/(a^2ρ), where μ0 is the permeability of free space.
jaunty bane