Tagged Questions
0
votes
1answer
58 views
Magnetic Field and the Speed of Light
Is it just a historical choice that both magnetic field and the Lorentz force equation include the speed of light?
I figure that whoever wrote up the equations (in cgs!) could have put both factors ...
3
votes
1answer
47 views
CGS Units for Magnetism
Why does the formula for magnetic field force include the speed of light in the denominator in cgs units? Where does the extra $c$ go in SI units?
0
votes
1answer
167 views
CGS Units to SI Units
This may be a stupid question but I am having trouble getting the same result in CGS units as I would if I used SI units for a unitless calculation.
I have to calculate $E_c=\frac{m_e c\, ...
3
votes
3answers
102 views
What is the missing proportionality constant in the magnetic levitation formula?
The formula for magnetic levitation is
$$ B \frac{dB}{dz} = \frac{ \rho g }{\chi} $$
but as always, I have a hard time figuring the units in SI. The left hand side is $\mathrm{T^2 /m}$, while $\chi$ ...
2
votes
1answer
136 views
Does the expression of the orbital magnetic dipole moment have $c$?
The orbital magnetic dipole moment of a particle with mass $m$ and charge $q$ can be shown to be related to the orbital angular momentum through the equation
$$\displaystyle ...
4
votes
3answers
808 views
Coulomb's Law: why is $k = \dfrac{1}{4\pi\epsilon_0}$
This was supposed to be a long question but something went wrong and everything I typed was lost. Here goes.
Why is $k = \dfrac{1}{4\pi\epsilon_0}$ in Coulomb's law?
Is this an experimental fact?
...
7
votes
1answer
307 views
Magnetic susceptibility in 1/eV
In this paper the authors refer to
transverse susceptibility $\chi_{ \perp}$ [meV $^{−1}$]
I was taught that the magnetic susceptibility is dimensionless.
How do I get $\chi$ in the above ...
